43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
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Fix CVE-2016-7953:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7953
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Patch copied from upstream source repository:
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https://cgit.freedesktop.org/xorg/lib/libXvMC/commit/?id=2cd95e7da8367cccdcdd5c9b160012d1dec5cbdb
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From 2cd95e7da8367cccdcdd5c9b160012d1dec5cbdb Mon Sep 17 00:00:00 2001
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From: Tobias Stoeckmann <tobias@stoeckmann.org>
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Date: Sun, 25 Sep 2016 22:34:27 +0200
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Subject: [PATCH] Avoid buffer underflow on empty strings.
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If an empty string is received from an x-server, do not underrun the
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buffer by accessing "rep.nameLen - 1" unconditionally, which could end
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up being -1.
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Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
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Reviewed-by: Matthieu Herrb <matthieu@herrb.eu>
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---
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src/XvMC.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/src/XvMC.c b/src/XvMC.c
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index 7336760..3ee4212 100644
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--- a/src/XvMC.c
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+++ b/src/XvMC.c
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@@ -576,9 +576,9 @@ Status XvMCGetDRInfo(Display *dpy, XvPortID port,
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if (*name && *busID && tmpBuf) {
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_XRead(dpy, tmpBuf, realSize);
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strncpy(*name,tmpBuf,rep.nameLen);
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- (*name)[rep.nameLen - 1] = '\0';
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+ (*name)[rep.nameLen == 0 ? 0 : rep.nameLen - 1] = '\0';
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strncpy(*busID,tmpBuf+rep.nameLen,rep.busIDLen);
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- (*busID)[rep.busIDLen - 1] = '\0';
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+ (*busID)[rep.busIDLen == 0 ? 0 : rep.busIDLen - 1] = '\0';
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XFree(tmpBuf);
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} else {
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XFree(*name);
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--
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2.10.1
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