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avcodec/dfa: Fix: runtime error: signed integer overflow: -14202 * 196877 cannot be represented in type 'int'

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Fixes: 1657/clusterfuzz-testcase-minimized-4710000079405056

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-18 01:54:43 +02:00
parent 3e295e633c
commit 58ac7fb9c3
1 changed files with 1 additions and 1 deletions
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libavcodec/dfa.c
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@ -250,7 +250,7 @@ static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height
segments = bytestream2_get_le16u(gb); segments = bytestream2_get_le16u(gb);
while ((segments & 0xC000) == 0xC000) { while ((segments & 0xC000) == 0xC000) {
unsigned skip_lines = -(int16_t)segments; unsigned skip_lines = -(int16_t)segments;
unsigned delta = -((int16_t)segments * width); int64_t delta = -((int16_t)segments * (int64_t)width);
if (frame_end - frame <= delta || y + lines + skip_lines > height) if (frame_end - frame <= delta || y + lines + skip_lines > height)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
frame += delta; frame += delta;