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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-07 20:43:24 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-08 23:19:15 +0100 |
| commit | a9fb75893bc7b8033f629b336e30ec06b819fd0e (patch) | |
| tree | 8a3cf9112fa3daf6ecf45aeeef876489e9d5d65b | |
| parent | c28752f03a9ea7d37099f6b36f121a355e608f82 (diff) | |
| download | ffmpeg-a9fb75893bc7b8033f629b336e30ec06b819fd0e.tar.gz | |
avcodec/diracdec: Fix integer overflow with quant
Fixes: signed integer overflow: 2 + 2147483646 cannot be represented in type 'int'
Fixes: 4792/clusterfuzz-testcase-minimized-6322450775146496
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 eaa93175895568ef6c2542b13104874907d9c4ef)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/diracdec.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c index 0b8b799dc0..4b5081ec18 100644 --- a/libavcodec/diracdec.c +++ b/libavcodec/diracdec.c @@ -502,16 +502,16 @@ static inline void codeblock(DiracContext *s, SubBand *b, } if (s->codeblock_mode && !(s->old_delta_quant && blockcnt_one)) { - int quant = b->quant; + int quant; if (is_arith) - quant += dirac_get_arith_int(c, CTX_DELTA_Q_F, CTX_DELTA_Q_DATA); + quant = dirac_get_arith_int(c, CTX_DELTA_Q_F, CTX_DELTA_Q_DATA); else - quant += dirac_get_se_golomb(gb); - if (quant < 0) { + quant = dirac_get_se_golomb(gb); + if (quant > INT_MAX - b->quant || b->quant + quant < 0) { av_log(s->avctx, AV_LOG_ERROR, "Invalid quant\n"); return; } - b->quant = quant; + b->quant += quant; } if (b->quant > (DIRAC_MAX_QUANT_INDEX - 1)) { |