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authorMike DePaulo <mikedep333@gmail.com>2015-02-08 22:19:01 -0500
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-14 16:14:31 +0100
commitbb7abd9da9badc6cb825c636867cbef827141f36 (patch)
treea14541b68c461db7093750c424b2254a88948c6c /nx-X11/lib/font
parentc6aebf9284855a0e24ad9c5ffdd36aa65e16bec7 (diff)
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CVE-2014-0211: integer overflow in fs_read_extent_info() from xorg/lib/libXfont commit c578408c1fd4db09e4e3173f8a9e65c81cc187c1
fs_read_extent_info() parses a reply from the font server. The reply contains a 32bit number of elements field which is used to calculate a buffer length. There is an integer overflow in this calculation which can lead to memory corruption.
Diffstat (limited to 'nx-X11/lib/font')
-rw-r--r--nx-X11/lib/font/fc/fserve.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/nx-X11/lib/font/fc/fserve.c b/nx-X11/lib/font/fc/fserve.c
index 2a6f6c97b..639964c55 100644
--- a/nx-X11/lib/font/fc/fserve.c
+++ b/nx-X11/lib/font/fc/fserve.c
@@ -73,6 +73,7 @@ in this Software without prior written authorization from The Open Group.
#include "fservestr.h"
#include <X11/fonts/fontutil.h>
#include <errno.h>
+#include <limits.h>
#include <time.h>
#define Time_t time_t
@@ -1060,7 +1061,16 @@ fs_read_extent_info(FontPathElementPtr fpe, FSBlockDataPtr blockrec)
numInfos *= 2;
haveInk = TRUE;
}
- ci = pCI = (CharInfoPtr) xalloc(sizeof(CharInfoRec) * numInfos);
+ if (numInfos >= (INT_MAX / sizeof(CharInfoRec))) {
+#ifdef DEBUG
+ fprintf(stderr,
+ "fsQueryXExtents16: numInfos (%d) >= %ld\n",
+ numInfos, (INT_MAX / sizeof(CharInfoRec)));
+#endif
+ pCI = NULL;
+ }
+ else
+ pCI = malloc(sizeof(CharInfoRec) * numInfos);
if (!pCI)
{