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avcodec/jpeg2000: Fixes integer overflow in ff_jpeg2000_ceildivpow2() 

Fixes: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 2231/clusterfuzz-testcase-minimized-4565181982048256

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 2017-06-15 23:26:18 +02:00
parent 611b356274
commit e3fadc57c5
1 changed files with 1 additions and 1 deletions
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libavcodec/jpeg2000.h
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@ -215,7 +215,7 @@ typedef struct Jpeg2000Component {
/* misc tools */
static inline int ff_jpeg2000_ceildivpow2(int a, int b)
{
return -(((int64_t)(-a)) >> b);
return -((-(int64_t)a) >> b);
}
static inline int ff_jpeg2000_ceildiv(int a, int b)