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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 21:50:12 +0100 |
| commit | eaa93175895568ef6c2542b13104874907d9c4ef (patch) | |
| tree | 0f2547bfcfdbbe5979f8f4a85eba28b1b40b62fb | |
| parent | 1bcd7fefcb3c1ec47978fdc64a9e8dfb9512ae62 (diff) | |
| download | ffmpeg-eaa93175895568ef6c2542b13104874907d9c4ef.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>
| -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 7157357d59..530e1c6ffd 100644 --- a/libavcodec/diracdec.c +++ b/libavcodec/diracdec.c @@ -509,16 +509,16 @@ 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)) { |