From 2db01a9a28c4d1aa5483fe7004e1cf2c50e5f1ee Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Fri, 1 May 2015 13:09:24 +0200 Subject: dix: Allow zero-height PutImage requests (fix for X.Org's CVE-2015-3418). The length checking code validates PutImage height and byte width by making sure that byte-width >= INT32_MAX / height. If height is zero, this generates a divide by zero exception. Allow zero height requests explicitly, bypassing the INT32_MAX check. Fix for regression introduced by fix for CVE-2014-8092. v2: backports to nx-libs 3.6.x (Mike Gabriel) v3: port to NXdispatch.c rather than dispatch.c (Mike DePaulo) Signed-off-by: Keith Packard --- nx-X11/programs/Xserver/hw/nxagent/NXdispatch.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/nx-X11/programs/Xserver/hw/nxagent/NXdispatch.c b/nx-X11/programs/Xserver/hw/nxagent/NXdispatch.c index e5bec8aba..0ed7277a1 100644 --- a/nx-X11/programs/Xserver/hw/nxagent/NXdispatch.c +++ b/nx-X11/programs/Xserver/hw/nxagent/NXdispatch.c @@ -2618,7 +2618,7 @@ ProcPutImage(register ClientPtr client) tmpImage = (char *)&stuff[1]; lengthProto = length; - if (lengthProto >= (INT32_MAX / stuff->height)) + if (stuff->height != 0 && lengthProto >= (INT32_MAX / stuff->height)) return BadLength; if (((((lengthProto * stuff->height) + (unsigned)3) >> 2) + -- cgit v1.2.3