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avcodec/exr: fix undefined shift in pxr24_uncompress()

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Fixes: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'
Fixes: 3787/clusterfuzz-testcase-minimized-5728764920070144

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 66f0c958bf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-11-04 01:19:19 +01:00
parent 78b8aeee58
commit 0ee2cb866c
1 changed files with 1 additions and 1 deletions
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2
libavcodec/exr.c
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@ -855,7 +855,7 @@ static int pxr24_uncompress(EXRContext *s, const uint8_t *src,
in = ptr[2] + td->xsize;
for (j = 0; j < td->xsize; ++j) {
uint32_t diff = (*(ptr[0]++) << 24) |
uint32_t diff = ((unsigned)*(ptr[0]++) << 24) |
(*(ptr[1]++) << 16) |
(*(ptr[2]++) << 8);
pixel += diff;