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| author | Alan Coopersmith <alan.coopersmith@oracle.com> | 2014-01-22 21:11:16 -0800 |
|---|---|---|
| committer | Mike Gabriel <mike.gabriel@das-netzwerkteam.de> | 2015-02-14 16:14:31 +0100 |
| commit | c1225fe6451d7a5f3741ce0fff8f54e38e0a14da (patch) | |
| tree | 17d97e36bcb0c57b66d9c9a6a75bfe036b818793 /nx-X11/programs/Xserver | |
| parent | 37e7fb1f64b29ef06ec4d69ab0b7afa99c613383 (diff) | |
| download | nx-libs-c1225fe6451d7a5f3741ce0fff8f54e38e0a14da.tar.gz nx-libs-c1225fe6451d7a5f3741ce0fff8f54e38e0a14da.tar.bz2 nx-libs-c1225fe6451d7a5f3741ce0fff8f54e38e0a14da.zip | |
dix: integer overflow in ProcPutImage() [CVE-2014-8092 1/4]
ProcPutImage() calculates a length field from a width, left pad and depth
specified by the client (if the specified format is XYPixmap).
The calculations for the total amount of memory the server needs for the
pixmap can overflow a 32-bit number, causing out-of-bounds memory writes
on 32-bit systems (since the length is stored in a long int variable).
v2: backport to nx-libs 3.6.x (Mike DePaulo)
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Conflicts:
dix/dispatch.c
Diffstat (limited to 'nx-X11/programs/Xserver')
| -rw-r--r-- | nx-X11/programs/Xserver/dix/dispatch.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/nx-X11/programs/Xserver/dix/dispatch.c b/nx-X11/programs/Xserver/dix/dispatch.c index 6941456de..5ad2f5af2 100644 --- a/nx-X11/programs/Xserver/dix/dispatch.c +++ b/nx-X11/programs/Xserver/dix/dispatch.c @@ -2071,7 +2071,9 @@ ProcPutImage(register ClientPtr client) tmpImage = (char *)&stuff[1]; lengthProto = length; - + if (lengthProto >= (INT32_MAX / stuff->height)) + return BadLength; + if (((((lengthProto * stuff->height) + (unsigned)3) >> 2) + (sizeof(xPutImageReq) >> 2)) != client->req_len) return BadLength; |