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lcldec: ensure that the offset for av_memcpy_backptr is valid.

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Originally committed as revision 19067 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-05-31 17:44:35 +00:00
parent 4ec42240ca
commit a7bfbe4e13
1 changed files with 1 additions and 0 deletions
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libavcodec/lcldec.c
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@ -93,6 +93,7 @@ static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsign
unsigned ofs = bytestream_get_le16(&srcptr); unsigned ofs = bytestream_get_le16(&srcptr);
unsigned cnt = (ofs >> 11) + 1; unsigned cnt = (ofs >> 11) + 1;
ofs &= 0x7ff; ofs &= 0x7ff;
ofs = FFMIN(ofs, destptr - destptr_bak);
cnt *= 4; cnt *= 4;
cnt = FFMIN(cnt, destptr_end - destptr); cnt = FFMIN(cnt, destptr_end - destptr);
av_memcpy_backptr(destptr, ofs, cnt); av_memcpy_backptr(destptr, ofs, cnt);