[FFmpeg-cvslog] avcodec/diracdec: Fix integer overflow in signed multiplication in UNPACK_ARITH()
Michael Niedermayer
git at videolan.org
Thu Oct 26 20:07:15 EEST 2017
ffmpeg | branch: release/3.0 | Michael Niedermayer <michael at niedermayer.cc> | Wed Jul 26 20:26:43 2017 +0200| [654e157d21614d1be7513f9cf9b1a0b0f9f2aab7] | committer: Michael Niedermayer
avcodec/diracdec: Fix integer overflow in signed multiplication in UNPACK_ARITH()
Fixes: runtime error: signed integer overflow: 1073741823 * 4 cannot be represented in type 'int'
Fixes: 2729/clusterfuzz-testcase-minimized-5902915464069120
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 8e275a74b09cc87f4334ed572f919b7647d4bea1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=654e157d21614d1be7513f9cf9b1a0b0f9f2aab7
---
libavcodec/diracdec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 05249f3157..3965861291 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -462,7 +462,8 @@ static inline int coeff_unpack_golomb(GetBitContext *gb, int qfactor, int qoffse
static inline void coeff_unpack_arith_##n(DiracArith *c, int qfactor, int qoffset, \
SubBand *b, type *buf, int x, int y) \
{ \
- int coeff, sign, sign_pred = 0, pred_ctx = CTX_ZPZN_F1; \
+ int sign, sign_pred = 0, pred_ctx = CTX_ZPZN_F1; \
+ unsigned coeff; \
const int mstride = -(b->stride >> (1+b->pshift)); \
if (b->parent) { \
const type *pbuf = (type *)b->parent->ibuf; \
More information about the ffmpeg-cvslog
mailing list