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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-02 15:52:52 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-21 23:43:52 +0100 |
| commit | 38cfa9d5f974086721e0d501e22b3b2eb1de0712 (patch) | |
| tree | 54f34933eef55d104d24735c31c14982c0591cd6 | |
| parent | aca0578002d9492c998205b68263ddf443b00c53 (diff) | |
| download | ffmpeg-38cfa9d5f974086721e0d501e22b3b2eb1de0712.tar.gz | |
avcodec/ralf: use multiply instead of shift to avoid undefined behavior in decode_block()
Fixes: left shift of negative value -249
Fixes: 18566/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5649394561187840
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 1b7d02642b2096622cee6165fea1301bb9ad54ff)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/ralf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c index 1d881cf7ae..ca8817aa21 100644 --- a/libavcodec/ralf.c +++ b/libavcodec/ralf.c @@ -408,7 +408,7 @@ static int decode_block(AVCodecContext *avctx, GetBitContext *gb, case 4: for (i = 0; i < len; i++) { t = ch1[i] + ctx->bias[1]; - t2 = ((ch0[i] + ctx->bias[0]) << 1) | (t & 1); + t2 = ((ch0[i] + ctx->bias[0]) * 2) | (t & 1); dst0[i] = (t2 + t) / 2; dst1[i] = (t2 - t) / 2; } |