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From 4c4123441e40da97acd10f58911193ad3dcef5cd Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Sat, 13 Apr 2013 14:43:48 -0700
Subject: [PATCH 8/8] avoid integer overflow in XF86VidModeGetModeLine()
rep.privsize is a CARD32 and needs to be bounds checked before multiplying
by sizeof(INT32) to come up with the total size to allocate & read to avoid
integer overflow, though it would not result in buffer overflow as the same
calculation was used for both allocation & reading from the network.
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
src/XF86VMode.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/XF86VMode.c b/src/XF86VMode.c
index a32564e..fb94816 100644
--- a/src/XF86VMode.c
+++ b/src/XF86VMode.c
@@ -271,7 +271,10 @@ XF86VidModeGetModeLine(Display* dpy, int screen, int* dotclock,
}
if (modeline->privsize > 0) {
- modeline->private = Xcalloc(modeline->privsize, sizeof(INT32));
+ if (modeline->privsize < (INT_MAX / sizeof(INT32)))
+ modeline->private = Xcalloc(modeline->privsize, sizeof(INT32));
+ else
+ modeline->private = NULL;
if (modeline->private == NULL) {
_XEatDataWords(dpy, rep.length -
((SIZEOF(xXF86VidModeGetModeLineReply) - SIZEOF(xReply)) >> 2));
--
1.8.2.3
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