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avcodec/dfa: Fix signed integer overflow: -2147483648 - 1 cannot be represented in type 'int'

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Fixes: 1368/clusterfuzz-testcase-minimized-4507293276176384

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 12936a4585bc293c0f88327d6840f49e8e744b62)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-06 16:38:22 +02:00
parent b7a69943e8
commit c767fc96e7
1 changed files with 2 additions and 1 deletions
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libavcodec/dfa.c
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@ -67,7 +67,8 @@ static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height
const uint8_t *frame_start = frame;
const uint8_t *frame_end = frame + width * height;
int mask = 0x10000, bitbuf = 0;
int v, count, segments;
int v, count;
unsigned segments;
unsigned offset;
segments = bytestream2_get_le32(gb);