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avcodec/diracdec: Fix integer overflow in signed multiplication in UNPACK_ARITH()

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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@niedermayer.cc>
(cherry picked from commit 8e275a74b0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-26 20:26:43 +02:00
parent f31fc4755f
commit 654e157d21
1 changed files with 2 additions and 1 deletions
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3
libavcodec/diracdec.c
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@ -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; \