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avcodec/ffv1dec_template: Fix undefined shift 

Fixes: runtime error: left shift of negative value -127
Fixes: 2834/clusterfuzz-testcase-minimized-5988039123795968

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-11 18:20:03 +02:00
parent 7735ed2974
commit 62702eebde
1 changed files with 1 additions and 1 deletions
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libavcodec/ffv1dec_template.c
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@ -149,7 +149,7 @@ static void RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[3], int w, int
}
if (lbd)
*((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
*((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + ((unsigned)g<<8) + ((unsigned)r<<16) + ((unsigned)a<<24);
else if (sizeof(TYPE) == 4) {
*((uint16_t*)(src[0] + x*2 + stride[0]*y)) = g;
*((uint16_t*)(src[1] + x*2 + stride[1]*y)) = b;