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lcldec: ensure that the offset for av_memcpy_backptr is valid.
author
Reimar Döffinger
<Reimar.Doeffinger@gmx.de>
Sun, 31 May 2009 17:44:35 +0000
(17:44 +0000)
committer
Reimar Döffinger
<Reimar.Doeffinger@gmx.de>
Sun, 31 May 2009 17:44:35 +0000
(17:44 +0000)
Originally committed as revision 19067 to svn://svn.ffmpeg.org/ffmpeg/trunk
libavcodec/lcldec.c
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diff --git
a/libavcodec/lcldec.c
b/libavcodec/lcldec.c
index
53637f2
..
bc7e11d
100644
(file)
--- a/
libavcodec/lcldec.c
+++ b/
libavcodec/lcldec.c
@@
-93,6
+93,7
@@
static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsign
unsigned ofs = bytestream_get_le16(&srcptr);
unsigned cnt = (ofs >> 11) + 1;
ofs &= 0x7ff;
+ ofs = FFMIN(ofs, destptr - destptr_bak);
cnt *= 4;
cnt = FFMIN(cnt, destptr_end - destptr);
av_memcpy_backptr(destptr, ofs, cnt);