[FFmpeg-cvslog] avcodec/dirac_dwt: Fix integer overflow in COMPOSE_53iL0()
Michael Niedermayer
git at videolan.org
Thu Feb 1 01:50:50 EET 2018
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Mon Oct 9 01:46:28 2017 +0200| [23ea9f91c03359d88031c522fbf06fd3b7fe0f20] | committer: Michael Niedermayer
avcodec/dirac_dwt: Fix integer overflow in COMPOSE_53iL0()
Fixes: runtime error: signed integer overflow: 2147483646 + 2 cannot be represented in type 'int'
Fixes: 3485/clusterfuzz-testcase-minimized-4940429332054016
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit bdee75a4e750735ab3039f004275ac8479072048)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=23ea9f91c03359d88031c522fbf06fd3b7fe0f20
---
libavcodec/dirac_dwt.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/dirac_dwt.h b/libavcodec/dirac_dwt.h
index 3b6b8b171b..8970a8602a 100644
--- a/libavcodec/dirac_dwt.h
+++ b/libavcodec/dirac_dwt.h
@@ -84,10 +84,10 @@ void ff_spatial_idwt_slice2(DWTContext *d, int y);
// shared stuff for simd optimizations
#define COMPOSE_53iL0(b0, b1, b2)\
- (b1 - ((b0 + b2 + 2) >> 2))
+ (b1 - ((int)(b0 + (unsigned)(b2) + 2) >> 2))
#define COMPOSE_DIRAC53iH0(b0, b1, b2)\
- (b1 + ((b0 + b2 + 1) >> 1))
+ (b1 + ((int)(b0 + (unsigned)(b2) + 1) >> 1))
#define COMPOSE_DD97iH0(b0, b1, b2, b3, b4)\
(b2 + ((int)(-b0 + 9U*b1 + 9U*b3 - b4 + 8) >> 4))
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