| Message ID | 20190620224721.8480-4-michael@niedermayer.cc |
|---|---|
| State | Accepted |
| Commit | f30be1ec9856551d96f3876eec5f8b8abf456b81 |
| Headers | show |
On Fri, Jun 21, 2019 at 12:47:18AM +0200, Michael Niedermayer wrote: > 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> > --- > libavcodec/alsdec.c | 3 +++ > 1 file changed, 3 insertions(+) will apply [...]
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index 8e0d3e5f83..4e5d5fd143 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--;
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> --- libavcodec/alsdec.c | 3 +++ 1 file changed, 3 insertions(+)