mirror of https://git.ffmpeg.org/ffmpeg.git
lcldec: ensure that the offset for av_memcpy_backptr is valid.
Originally committed as revision 19067 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -93,6 +93,7 @@ static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsign
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unsigned ofs = bytestream_get_le16(&srcptr);
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unsigned ofs = bytestream_get_le16(&srcptr);
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unsigned cnt = (ofs >> 11) + 1;
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unsigned cnt = (ofs >> 11) + 1;
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ofs &= 0x7ff;
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ofs &= 0x7ff;
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ofs = FFMIN(ofs, destptr - destptr_bak);
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cnt *= 4;
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cnt *= 4;
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cnt = FFMIN(cnt, destptr_end - destptr);
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cnt = FFMIN(cnt, destptr_end - destptr);
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av_memcpy_backptr(destptr, ofs, cnt);
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av_memcpy_backptr(destptr, ofs, cnt);
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