Merge branch 'release/experimental/1.0.30-1_experimental1'experimental/1.0.30-1_experimental1

17 files changed, 217 insertions, 115 deletions

diff --git a/.gitignore b/.gitignore
index ce86210..aed89bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,6 @@
 *.po~
 .deps/
 .libs/
-.pc/
 
 # files generated during the configure step
 Makefile
diff --git a/NEWS b/NEWS
index 9f503b9..e9829e8 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,31 @@
 <!-- -*- Mode: markdown -*- -->
 
-## New with 1.0.29 (upcoming release)
+## New with 1.0.30 (released 2020-05-17)
+
+This release fixes several security related issues and a build issue.
+
+### Backends
+
+- `epson2`: fixes CVE-2020-12867 (GHSL-2020-075) and several memory
+  management issues found while addressing that CVE
+- `epsonds`: addresses out-of-bound memory access issues to fix
+  CVE-2020-12862 (GHSL-2020-082) and CVE-2020-12863 (GHSL-2020-083),
+  addresses a buffer overflow fixing CVE-2020-12865 (GHSL-2020-084)
+  and disables network autodiscovery to mitigate CVE-2020-12866
+  (GHSL-2020-079), CVE-2020-12861 (GHSL-2020-080) and CVE-2020-12864
+  (GHSL-2020-081).  Note that this backend does not support network
+  scanners to begin with.
+- `magicolor`: fixes a floating point exception and uninitialized data
+  read
+- fixes an overflow in `sanei_tcp_read()`
+
+### Build
+
+- fixes a build issue where linker flags would become link time
+  dependencies (#239)
+
+
+## New with 1.0.29 (released 2020-02-02)
 
 ### Backends
 
@@ -36,6 +61,7 @@
   irrespective of the `pthread_t` type (#153)
 - moves the `genesys` and `pixma` backends to a directory of their own
 
+
 ## New with 1.0.28 (released 2019-07-31)
 
 ### Backends
diff --git a/backend/Makefile.am b/backend/Makefile.am
index 1dc1a58..4a947bf 100644
--- a/backend/Makefile.am
+++ b/backend/Makefile.am
@@ -1221,4 +1221,4 @@ libsane_la_LDFLAGS = $(DIST_LIBS_LDFLAGS)
 libsane_la_LIBADD = $(COMMON_LIBS) $(PRELOADABLE_BACKENDS_ENABLED) libdll_preload.la sane_strstatus.lo ../sanei/sanei_init_debug.lo ../sanei/sanei_constrain_value.lo ../sanei/sanei_config.lo $(PRELOADABLE_BACKENDS_LIBS) $(DL_LIBS) $(XML_LIBS)
 
 # WARNING: Automake is getting this wrong so have to do it ourselves.
-libsane_la_DEPENDENCIES = $(COMMON_LIBS) $(PRELOADABLE_BACKENDS_ENABLED) libdll_preload.la sane_strstatus.lo ../sanei/sanei_init_debug.lo ../sanei/sanei_constrain_value.lo ../sanei/sanei_config.lo $(PRELOADABLE_BACKENDS_DEPS)
+libsane_la_DEPENDENCIES = ../lib/liblib.la $(PRELOADABLE_BACKENDS_ENABLED) libdll_preload.la sane_strstatus.lo ../sanei/sanei_init_debug.lo ../sanei/sanei_constrain_value.lo ../sanei/sanei_config.lo $(PRELOADABLE_BACKENDS_DEPS)
diff --git a/backend/epson2_net.c b/backend/epson2_net.c
index 8d0fe9e..7f804ee 100644
--- a/backend/epson2_net.c
+++ b/backend/epson2_net.c
@@ -32,11 +32,12 @@
 
 #include "sane/sanei_debug.h"
 
-static int
+static ssize_t
 sanei_epson_net_read_raw(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
 		       SANE_Status *status)
 {
-	int ready, read = -1;
+	int ready;
+	ssize_t read = -1;
 	fd_set readable;
 	struct timeval tv;
 
@@ -62,111 +63,136 @@ sanei_epson_net_read_raw(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
 	return read;
 }
 
-int
-sanei_epson_net_read(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
+static ssize_t
+sanei_epson_net_read_buf(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
 		       SANE_Status * status)
 {
-	ssize_t size;
 	ssize_t read = 0;
-	unsigned char header[12];
 
-	/* read from buffer, if available */
-	if (s->netptr != s->netbuf) {
-		DBG(23, "reading %lu from buffer at %p, %lu available\n",
-			(u_long) wanted, s->netptr, (u_long) s->netlen);
+	DBG(23, "%s: reading up to %lu from buffer at %p, %lu available\n",
+		__func__, (u_long) wanted, s->netptr, (u_long) s->netlen);
 
-		memcpy(buf, s->netptr, wanted);
-		read = wanted;
+	if ((size_t) wanted > s->netlen) {
+		*status = SANE_STATUS_IO_ERROR;
+		wanted = s->netlen;
+	}
 
-		s->netlen -= wanted;
+	memcpy(buf, s->netptr, wanted);
+	read = wanted;
 
-		if (s->netlen == 0) {
-			DBG(23, "%s: freeing %p\n", __func__, s->netbuf);
-			free(s->netbuf);
-			s->netbuf = s->netptr = NULL;
-			s->netlen = 0;
-		}
+	s->netptr += read;
+	s->netlen -= read;
+
+	if (s->netlen == 0) {
+		DBG(23, "%s: freeing %p\n", __func__, s->netbuf);
+		free(s->netbuf);
+		s->netbuf = s->netptr = NULL;
+		s->netlen = 0;
+	}
+
+	return read;
+}
+
+ssize_t
+sanei_epson_net_read(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
+		       SANE_Status * status)
+{
+	if (wanted < 0) {
+		*status = SANE_STATUS_INVAL;
+		return 0;
+	}
+
+	size_t size;
+	ssize_t read = 0;
+	unsigned char header[12];
 
-		return read;
+	/* read from remainder of buffer */
+	if (s->netptr) {
+		return sanei_epson_net_read_buf(s, buf, wanted, status);
 	}
 
 	/* receive net header */
-	size = sanei_epson_net_read_raw(s, header, 12, status);
-	if (size != 12) {
+	read = sanei_epson_net_read_raw(s, header, 12, status);
+	if (read != 12) {
 		return 0;
 	}
 
+	/* validate header */
 	if (header[0] != 'I' || header[1] != 'S') {
 		DBG(1, "header mismatch: %02X %02x\n", header[0], header[1]);
 		*status = SANE_STATUS_IO_ERROR;
 		return 0;
 	}
 
+	/* parse payload size */
 	size = be32atoh(&header[6]);
 
-	DBG(23, "%s: wanted = %lu, available = %lu\n", __func__,
-		(u_long) wanted, (u_long) size);
-
 	*status = SANE_STATUS_GOOD;
 
-	if (size == wanted) {
-
-		DBG(15, "%s: full read\n", __func__);
-
-		read = sanei_epson_net_read_raw(s, buf, size, status);
+	if (!s->netbuf) {
+		DBG(15, "%s: direct read\n", __func__);
+		DBG(23, "%s: wanted = %lu, available = %lu\n", __func__,
+			(u_long) wanted, (u_long) size);
 
-		if (s->netbuf) {
-			free(s->netbuf);
-			s->netbuf = NULL;
-			s->netlen = 0;
+		if ((size_t) wanted > size) {
+			wanted = size;
 		}
 
-		if (read < 0) {
-			return 0;
-		}
-
-/*	} else if (wanted < size && s->netlen == size) { */
+		read = sanei_epson_net_read_raw(s, buf, wanted, status);
 	} else {
-		DBG(23, "%s: partial read\n", __func__);
+		DBG(15, "%s: buffered read\n", __func__);
+		DBG(23, "%s: bufferable = %lu, available = %lu\n", __func__,
+			(u_long) s->netlen, (u_long) size);
 
-		read = sanei_epson_net_read_raw(s, s->netbuf, size, status);
-		if (read != size) {
-			return 0;
+		if (s->netlen > size) {
+			s->netlen = size;
 		}
 
-		s->netlen = size - wanted;
-		s->netptr += wanted;
-		read = wanted;
-
-		DBG(23, "0,4 %02x %02x\n", s->netbuf[0], s->netbuf[4]);
-		DBG(23, "storing %lu to buffer at %p, next read at %p, %lu bytes left\n",
-			(u_long) size, s->netbuf, s->netptr, (u_long) s->netlen);
+		/* fill buffer */
+		read = sanei_epson_net_read_raw(s, s->netbuf, s->netlen, status);
+		s->netptr = s->netbuf;
+		s->netlen = (read > 0 ? read : 0);
 
-		memcpy(buf, s->netbuf, wanted);
+		/* copy wanted part */
+		read = sanei_epson_net_read_buf(s, buf, wanted, status);
 	}
 
 	return read;
 }
 
-
-int
+size_t
 sanei_epson_net_write(Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
 			size_t buf_size, size_t reply_len, SANE_Status *status)
 {
 	unsigned char *h1, *h2, *payload;
 	unsigned char *packet = malloc(12 + 8 + buf_size);
 
-	/* XXX check allocation failure */
+	if (!packet) {
+		*status = SANE_STATUS_NO_MEM;
+		return 0;
+	}
 
 	h1 = packet;
 	h2 = packet + 12;
 	payload = packet + 12 + 8;
 
 	if (reply_len) {
-		s->netbuf = s->netptr = malloc(reply_len);
+		if (s->netbuf) {
+			DBG(23, "%s, freeing %p, %ld bytes unprocessed\n",
+				__func__, s->netbuf, (u_long) s->netlen);
+			free(s->netbuf);
+			s->netbuf = s->netptr = NULL;
+			s->netlen = 0;
+		}
+		s->netbuf = malloc(reply_len);
+		if (!s->netbuf) {
+			free(packet);
+			*status = SANE_STATUS_NO_MEM;
+			return 0;
+		}
 		s->netlen = reply_len;
-		DBG(24, "allocated %lu bytes at %p\n",
-			(u_long) reply_len, s->netbuf);
+		DBG(24, "%s: allocated %lu bytes at %p\n", __func__,
+			(u_long) s->netlen, s->netbuf);
 	}
 
 	DBG(24, "%s: cmd = %04x, buf = %p, buf_size = %lu, reply_len = %lu\n",
diff --git a/backend/epson2_net.h b/backend/epson2_net.h
index 6aef2b7..7db671b 100644
--- a/backend/epson2_net.h
+++ b/backend/epson2_net.h
@@ -4,9 +4,9 @@
 #include <sys/types.h>
 #include "../include/sane/sane.h"
 
-extern int sanei_epson_net_read(struct Epson_Scanner *s, unsigned char *buf, ssize_t buf_size,
+extern ssize_t sanei_epson_net_read(struct Epson_Scanner *s, unsigned char *buf, ssize_t buf_size,
 				SANE_Status *status);
-extern int sanei_epson_net_write(struct Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
+extern size_t sanei_epson_net_write(struct Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
 				size_t buf_size, size_t reply_len,
 				SANE_Status *status);
 extern SANE_Status sanei_epson_net_lock(struct Epson_Scanner *s);
diff --git a/backend/epsonds-cmd.c b/backend/epsonds-cmd.c
index 9a4db30..5141e07 100644
--- a/backend/epsonds-cmd.c
+++ b/backend/epsonds-cmd.c
@@ -117,7 +117,7 @@ esci2_check_header(const char *cmd, const char *buf, unsigned int *more)
 		return 0;
 	}
 
-	err = sscanf(&buf[5], "%x#", more);
+	err = sscanf(&buf[5], "%7x#", more);
 	if (err != 1) {
 		DBG(1, "cannot decode length from header\n");
 		return 0;
@@ -193,6 +193,8 @@ static SANE_Status esci2_cmd(epsonds_scanner* s,
 
 			ssize_t read = eds_recv(s, pbuf, more, &status);
 			if (read != more) {
+				free(pbuf);
+				return SANE_STATUS_IO_ERROR;
 			}
 
 			/* parse the received data block */
@@ -255,18 +257,20 @@ static int decode_value(char *buf, int len)
 }
 
 /* h000 */
-static char *decode_binary(char *buf)
+static char *decode_binary(char *buf, int len)
 {
 	char tmp[6];
 	int hl;
 
 	memcpy(tmp, buf, 4);
 	tmp[4] = '\0';
+	len -= 4;
 
 	if (buf[0] != 'h')
 		return NULL;
 
 	hl = strtol(tmp + 1, NULL, 16);
+	if (hl > len) hl = len;
 	if (hl) {
 
 		char *v = malloc(hl + 1);
@@ -279,9 +283,9 @@ static char *decode_binary(char *buf)
 	return NULL;
 }
 
-static char *decode_string(char *buf)
+static char *decode_string(char *buf, int len)
 {
-	char *p, *s = decode_binary(buf);
+	char *p, *s = decode_binary(buf, len);
 	if (s == NULL)
 		return NULL;
 
@@ -326,20 +330,20 @@ static SANE_Status info_cb(void *userdata, char *token, int len)
 
 	if (strncmp("PRD", token, 3) == 0) {
 		free(s->hw->model);
-		s->hw->model = decode_string(value);
+		s->hw->model = decode_string(value, len);
 		s->hw->sane.model = s->hw->model;
 		DBG(1, " product: %s\n", s->hw->model);
 		/* we will free the string later */
 	}
 
 	if (strncmp("VER", token, 3) == 0) {
-		char *v = decode_string(value);
+		char *v = decode_string(value, len);
 		DBG(1, " version: %s\n", v);
 		free(v);
 	}
 
 	if (strncmp("S/N", token, 3) == 0) {
-		char *v = decode_string(value);
+		char *v = decode_string(value, len);
 		DBG(1, "  serial: %s\n", v);
 		free(v);
 	}
@@ -876,6 +880,11 @@ esci2_img(struct epsonds_scanner *s, SANE_Int *length)
 		return parse_status;
 	}
 
+	/* more data than was accounted for in s->buf */
+	if (more > s->bsz) {
+		return SANE_STATUS_IO_ERROR;
+	}
+
 	/* ALWAYS read image data */
 	if (s->hw->connection == SANE_EPSONDS_NET) {
 		epsonds_net_request_read(s, more);
diff --git a/backend/epsonds.c b/backend/epsonds.c
index ff5d681..fb9694a 100644
--- a/backend/epsonds.c
+++ b/backend/epsonds.c
@@ -1230,16 +1230,18 @@ sane_start(SANE_Handle handle)
 	if (s->line_buffer == NULL)
 		return SANE_STATUS_NO_MEM;
 
-	/* ring buffer for front page, twice bsz */
+	/* transfer buffer size, bsz */
 	/* XXX read value from scanner */
-	status = eds_ring_init(&s->front, (65536 * 4) * 2);
+	s->bsz = (65536 * 4);
+
+	/* ring buffer for front page */
+	status = eds_ring_init(&s->front, s->bsz * 2);
 	if (status != SANE_STATUS_GOOD) {
 		return status;
 	}
 
-	/* transfer buffer, bsz */
-	/* XXX read value from scanner */
-	s->buf = realloc(s->buf, 65536 * 4);
+	/* transfer buffer */
+	s->buf = realloc(s->buf, s->bsz);
 	if (s->buf == NULL)
 		return SANE_STATUS_NO_MEM;
 
diff --git a/backend/epsonds.conf.in b/backend/epsonds.conf.in
index b8b3623..1967a00 100644
--- a/backend/epsonds.conf.in
+++ b/backend/epsonds.conf.in
@@ -10,7 +10,7 @@ usb
 # e.g.:
 # usb 0x4b8 0x14c
 
-# Network
+# Network (not yet supported!)
 #
 # net 192.168.1.123
-net autodiscovery
+#net autodiscovery
diff --git a/backend/epsonds.h b/backend/epsonds.h
index 0427ef3..401b0f3 100644
--- a/backend/epsonds.h
+++ b/backend/epsonds.h
@@ -160,6 +160,7 @@ struct epsonds_scanner
 	Option_Value val[NUM_OPTIONS];
 	SANE_Parameters params;
 
+	size_t bsz;		/* transfer buffer size */
 	SANE_Byte *buf, *line_buffer;
 	ring_buffer *current, front, back;
 
diff --git a/backend/magicolor.c b/backend/magicolor.c
index af9fb1a..0b079fa 100644
--- a/backend/magicolor.c
+++ b/backend/magicolor.c
@@ -114,7 +114,7 @@ static struct MagicolorCap magicolor_cap[] = {
 
   /* KONICA MINOLTA magicolor 1690MF, USB ID 0x123b:2089 */
   {
-      0x2089, "mc1690mf", "KONICA MINOLTA magicolor 1690MF", "1.3.6.1.4.1.183341.1.1.2.1.32.3.2",
+      0x2089, "mc1690mf", "KONICA MINOLTA magicolor 1690MF", ".1.3.6.1.4.1.18334.1.1.1.1.1.23.1.1",
       -1, 0x85,
       600, {150, 600, 0}, magicolor_default_resolutions, 3,  /* 600 dpi max, 3 resolutions */
       8, magicolor_default_depths,                          /* color depth 8 default, 1 and 8 possible */
@@ -836,6 +836,26 @@ cmd_get_scanning_parameters(SANE_Handle handle,
 		        *data_pixels, *data_pixels,
 		        *lines, *lines,
 		        *pixels_per_line, *pixels_per_line);
+
+		/*
+		 * SECURITY REMEDIATION
+		 * See gitlab issue #279 - Issue10 SIGFPE in mc_setup_block_mode
+		 *
+		 * pixels_per_line cannot be zero, otherwise a division by zero error can occur later.
+		 * Added checking the parameters to ensure that this issue cannot occur.
+		 *
+		 * Additionally to the reported issue, it makes no sense for any of the values of
+		 * data_pixels, lines or pixels_per_line to be zero. I do not have any knowledge
+		 * of valid maximums for these parameters.
+		 *
+		 */
+		if ((*data_pixels == 0) || (*lines == 0) || (*pixels_per_line == 0)) {
+			DBG (1, "%s: ERROR: Returned image parameters contain invalid "
+				"bytes. Zero values for these parameters are not rational.\n",
+				__func__);
+			dump_hex_buffer_dense (1, rxbuf, 8);
+			return SANE_STATUS_INVAL;
+		}
 	}
 
 	return status;
@@ -1525,8 +1545,10 @@ mc_get_device_from_identification (const char*ident)
 {
 	int n;
 	for (n = 0; n < NELEMS (magicolor_cap); n++) {
-		if (strcmp (magicolor_cap[n].model, ident) || strcmp (magicolor_cap[n].OID, ident))
+		if ((strcmp (magicolor_cap[n].model, ident) == 0) || (strcmp (magicolor_cap[n].OID, ident) == 0))
+		{
 			return &magicolor_cap[n];
+		}
 	}
 	return NULL;
 }
@@ -1833,9 +1855,9 @@ mc_network_discovery_handle (struct snmp_pdu *pdu, snmp_discovery_data *magic)
 	oid anOID[MAX_OID_LEN];
 	size_t anOID_len = MAX_OID_LEN;
 	/* Device information variables */
-	char ip_addr[1024];
-	char model[1024];
-	char device[1024];
+	char ip_addr[1024] = "";
+	char model[1024] = "";
+	char device[1024] = "";
 	/* remote IP detection variables */
 	netsnmp_indexed_addr_pair *responder = (netsnmp_indexed_addr_pair *) pdu->transport_data;
 	struct sockaddr_in *remote = NULL;
@@ -1884,6 +1906,13 @@ mc_network_discovery_handle (struct snmp_pdu *pdu, snmp_discovery_data *magic)
 			DBG (3, "%s: SystemObjectID does not return an OID, device is not a magicolor device\n", __func__);
 			return 0;
 		}
+
+		// Make sure that snprint_objid gives us just numbers, instead of a
+		// SNMPv2-SMI::enterprises prefix.
+		netsnmp_ds_set_int(NETSNMP_DS_LIBRARY_ID,
+				   NETSNMP_DS_LIB_OID_OUTPUT_FORMAT,
+				   NETSNMP_OID_OUTPUT_NUMERIC);
+
 		snprint_objid (device, sizeof(device), vp->val.objid, value_len);
 		DBG (5, "%s: Device object ID is '%s'\n", __func__, device);
 
@@ -1903,8 +1932,9 @@ mc_network_discovery_handle (struct snmp_pdu *pdu, snmp_discovery_data *magic)
 	read_objid(MAGICOLOR_SNMP_SYSDESCR_OID, anOID, &anOID_len);
 	vp = find_varbind_in_list (varlist, anOID, anOID_len);
 	if (vp) {
-		memcpy(model,vp->val.string,vp->val_len);
-		model[vp->val_len] = '\0';
+		size_t model_len = min(vp->val_len, sizeof(model) - 1);
+		memcpy(model, vp->val.string, model_len);
+		model[model_len] = '\0';
 		DBG (5, "%s: Found model: %s\n", __func__, model);
 	}
 
diff --git a/debian/changelog b/debian/changelog
index 00701ef..14504bb 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,21 @@
+sane-backends (1.0.30-1~experimental1) experimental; urgency=medium
+
+  * New upstream release (Closes: #961302):
+    - fixes CVE-2020-12867, CVE-2020-12862, CVE-2020-12863, CVE-2020-12865,
+      CVE-2020-12861, CVE-2020-12864.
+  * Migrate to debhelper 13:
+    - Bump minimum debhelper-compat version in debian/control to = 13.
+  * debian/watch: Fix to new gitlab download structure.
+  * debian/rules:
+    - Remove DEB_LDFLAGS_MAINT_APPEND after lintian warning.
+    - Add override_dh_installman-arch to remove obsolete man page sane-config.1.
+  * debian/control:
+    - Replace Conflicts with Breaks.
+  * Remove debian/libsane-dev.preinst because sane-config was removed in
+    oldstable.
+
+ -- Jörg Frings-Fürst <debian@jff.email>  Sun, 24 May 2020 19:45:00 +0200
+
 sane-backends (1.0.29-1~experimental4) experimental; urgency=medium
 
   * Add HOST_NAME_MAX to debian/patches/0155-hurd_PATH_MAX.patch.
diff --git a/debian/control b/debian/control
index 344f204..fe40df3 100644
--- a/debian/control
+++ b/debian/control
@@ -7,7 +7,7 @@ Build-Depends:
  autoconf,
  autoconf-archive,
  chrpath,
- debhelper-compat (= 12),
+ debhelper-compat (= 13),
  gettext,
  libavahi-client-dev,
  libcam-dev [kfreebsd-any],
@@ -84,7 +84,7 @@ Package: libsane1
 Section: libs
 Architecture: any
 Multi-Arch: same
-Conflicts: libsane (<< 1.0.29-1~)
+Breaks: libsane (<< 1.0.29-1~)
 Replaces: libsane (<< 1.0.29-1~)
 Provides: libsane (= ${binary:Version})
 Depends:
diff --git a/debian/libsane-dev.preinst b/debian/libsane-dev.preinst
deleted file mode 100644
index d547bda..0000000
--- a/debian/libsane-dev.preinst
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/bin/sh
-set -e
-
-
-
-case "$1" in
-    install|upgrade|abort-upgrade)
-#
-# remove obsolete files
-#
-	rm -f /usr/bin/sane-config.*
-	if [ -h /usr/bin/sane-config ] ; then
-	    rm -f /usr/bin/sane-config
-	fi
-	;;
-    *)
-        echo "preinst called with unknown argument \`$1'" >&2
-        exit 1
-	;;
-esac
-
-
-#DEBHELPER#
diff --git a/debian/rules b/debian/rules
index 05d8b98..eac8ba3 100755
--- a/debian/rules
+++ b/debian/rules
@@ -2,7 +2,6 @@
 #export DH_VERBOSE=1
 
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
-export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
 
 include /usr/share/dpkg/default.mk
 
@@ -93,6 +92,10 @@ override_dh_installman-indep:
         # remove manpages for not build libs
 	$(RM) $(CURDIR)/debian/libsane-common/usr/share/man/man5/sane-v4l.5
 
+override_dh_installman-arch:
+	dh_installman
+	$(RM) $(CURDIR)/debian/sane-utils/usr/share/man/man1/sane-config.1
+
 override_dh_installdocs-arch:
 	dh_installdocs
 	# move files that belong to libsane-dev
diff --git a/debian/watch b/debian/watch
index ae623cb..c384aa1 100644
--- a/debian/watch
+++ b/debian/watch
@@ -6,4 +6,4 @@ opts=\
 dversionmangle=s/\+(debian|dfsg|ds|deb)\d*$//,\
 uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/,\
 filenamemangle=s/.*\/archive\/(\d\S+)\/backends.*\.tar\.gz/backends-$1\.tar\.gz/g \
- https://gitlab.com/sane-project/backends/tags?sort=updated_desc .*/archive/(\d\S+)/.*\.tar\.gz.*
+  https://gitlab.com/sane-project/backends/-/tags?sort=updated_desc .*/archive/(\d\S+)/.*\.tar\.gz.*
diff --git a/include/sane/sanei_tcp.h b/include/sane/sanei_tcp.h
index 227e613..a375c39 100644
--- a/include/sane/sanei_tcp.h
+++ b/include/sane/sanei_tcp.h
@@ -31,7 +31,7 @@
 
 extern SANE_Status sanei_tcp_open(const char *host, int port, int *fdp);
 extern void sanei_tcp_close(int fd);
-extern ssize_t sanei_tcp_write(int fd, const u_char * buf, int count);
-extern ssize_t sanei_tcp_read(int fd, u_char * buf, int count);
+extern ssize_t sanei_tcp_write(int fd, const u_char * buf, size_t count);
+extern ssize_t sanei_tcp_read(int fd, u_char * buf, size_t count);
 
 #endif /* sanei_tcp_h */
diff --git a/sanei/sanei_tcp.c b/sanei/sanei_tcp.c
index 87a73d1..d6f8efe 100644
--- a/sanei/sanei_tcp.c
+++ b/sanei/sanei_tcp.c
@@ -45,6 +45,11 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
+
+#ifndef SSIZE_MAX
+#define SSIZE_MAX LONG_MAX
+#endif
 
 #ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
@@ -115,15 +120,21 @@ sanei_tcp_close(int fd)
 }
 
 ssize_t
-sanei_tcp_write(int fd, const u_char * buf, int count)
+sanei_tcp_write(int fd, const u_char * buf, size_t count)
 {
 	return send(fd, buf, count, 0);
 }
 
 ssize_t
-sanei_tcp_read(int fd, u_char * buf, int count)
+sanei_tcp_read(int fd, u_char * buf, size_t count)
 {
-        ssize_t bytes_recv = 0, rc = 1;
+	size_t bytes_recv = 0;
+	ssize_t rc = 1;
+
+	if (count > SSIZE_MAX) {
+		errno = EINVAL;
+		return -1;
+	}
 
 	while (bytes_recv < count && rc > 0)
 	{