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dfa: check for invalid access in decode_wdlt().

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This can happen when the number of skipped lines is not consistent with
the number of coded lines.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-03-27 18:18:38 +01:00
parent dbb1425811
commit 3623589edc
1 changed files with 2 additions and 0 deletions
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2
libavcodec/dfa.c
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@ -255,6 +255,8 @@ static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height
segments = bytestream2_get_le16(gb);
}
line_ptr = frame;
if (frame_end - frame < width)
return AVERROR_INVALIDDATA;
frame += width;
y++;
while (segments--) {