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avcodec/dirac_dwt: Fix integer overflow in COMPOSE_DD137iL0() 

Fixes: 4035/clusterfuzz-testcase-minimized-6479308925173760
Fixes: runtime error: signed integer overflow: 9 * 402653183 cannot be represented in type 'int'

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 2017-11-14 03:40:07 +01:00
parent 65e0a7c473
commit 73964680d7
1 changed files with 1 additions and 1 deletions
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libavcodec/dirac_dwt.h
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@ -102,7 +102,7 @@ void ff_spatial_idwt_slice2(DWTContext *d, int y);
(b2 + ((int)(-b0 + 9U*b1 + 9U*b3 - b4 + 8) >> 4))
#define COMPOSE_DD137iL0(b0, b1, b2, b3, b4)\
(b2 - ((-b0 + 9*b1 + 9*b3 - b4 + 16) >> 5))
(b2 - ((int)(-b0 + 9U*b1 + 9U*b3 - b4 + 16) >> 5))
#define COMPOSE_HAARiL0(b0, b1)\
(b0 - ((b1 + 1) >> 1))