[FFmpeg-cvslog] avcodec/alsdec: Fix invalid shift in multiply()
Michael Niedermayer
git at videolan.org
Wed Jun 26 23:16:02 EEST 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun 20 19:09:11 2019 +0200| [f30be1ec9856551d96f3876eec5f8b8abf456b81] | committer: Michael Niedermayer
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 at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f30be1ec9856551d96f3876eec5f8b8abf456b81
---
libavcodec/alsdec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index ca8701e6d0..891f742e7e 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1379,6 +1379,9 @@ 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--;
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