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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-06-20 19:09:11 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-01 12:11:55 +0200 |
| commit | 70afff15e5c431560fceecbc98728d67244f0823 (patch) | |
| tree | 710c32285fab9dedc86c9c7fcf1dee0022faa84e | |
| parent | 424a6cda849c85fe5e3fb753b948a4707a0a2777 (diff) | |
| download | ffmpeg-70afff15e5c431560fceecbc98728d67244f0823.tar.gz | |
avcodec/alsdec: Fix invalid shift in multiply()
Fixes: shift exponent -24 is negative
Fixes: 15292/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5768533318828032
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 f30be1ec9856551d96f3876eec5f8b8abf456b81)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/alsdec.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index 3986347ee2..a9ed2cefda 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -1385,6 +1385,9 @@ static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) { mantissa_temp = (uint64_t)a.mant * (uint64_t)b.mant; mask_64 = (uint64_t)0x1 << 47; + if (!mantissa_temp) + return FLOAT_0; + // Count the valid bit count while (!(mantissa_temp & mask_64) && mask_64) { bit_count--; |