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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>
This commit is contained in:
Michael Niedermayer
2017-05-06 16:38:22 +02:00
parent 4ace2d2219
commit 12936a4585
1 changed files with 2 additions and 1 deletions
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3
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_start = frame;
const uint8_t *frame_end = frame + width * height; const uint8_t *frame_end = frame + width * height;
int mask = 0x10000, bitbuf = 0; int mask = 0x10000, bitbuf = 0;
int v, count, segments; int v, count;
unsigned segments;
unsigned offset; unsigned offset;
segments = bytestream2_get_le32(gb); segments = bytestream2_get_le32(gb);