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Description: Address memory corruption and information leakage
cheery-picked from upstream git commit 42896939822b44f44ecd1b6d35afdfa4473ed35d
Author: Jörg Frings-Fürst <debian@jff-webhosting.net>
Origin: https://anonscm.debian.org/cgit/sane/sane-backends.git/commit/frontend/saned.c?id=42896939822b44f44ecd1b6d35afdfa4473ed35d
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854804
Forwarded: not-needed
Last-Update: 2017-04-19
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
Index: jessie/frontend/saned.c
===================================================================
--- jessie.orig/frontend/saned.c
+++ jessie/frontend/saned.c
@@ -1986,6 +1986,38 @@ process_request (Wire * w)
return 1;
}
+ /* Addresses CVE-2017-6318 (#315576, Debian BTS #853804) */
+ /* This is done here (rather than in sanei/sanei_wire.c where
+ * it should be done) to minimize scope of impact and amount
+ * of code change.
+ */
+ if (w->direction == WIRE_DECODE
+ && req.value_type == SANE_TYPE_STRING
+ && req.action == SANE_ACTION_GET_VALUE)
+ {
+ if (req.value)
+ {
+ /* FIXME: If req.value contains embedded NUL
+ * characters, this is wrong but we do not have
+ * access to the amount of memory allocated in
+ * sanei/sanei_wire.c at this point.
+ */
+ w->allocated_memory -= (1 + strlen (req.value));
+ free (req.value);
+ }
+ req.value = malloc (req.value_size);
+ if (!req.value)
+ {
+ w->status = ENOMEM;
+ DBG (DBG_ERR,
+ "process_request: (control_option) "
+ "h=%d (%s)\n", req.handle, strerror (w->status));
+ return 1;
+ }
+ memset (req.value, 0, req.value_size);
+ w->allocated_memory += req.value_size;
+ }
+
can_authorize = 1;
memset (&reply, 0, sizeof (reply)); /* avoid leaking bits */
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