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avcodec/lagarith: Fix runtime error: left shift of negative value -1
author
Michael Niedermayer
<michael@niedermayer.cc>
Tue, 9 May 2017 22:50:05 +0000
(
00:50
+0200)
committer
Michael Niedermayer
<michael@niedermayer.cc>
Tue, 9 May 2017 23:10:55 +0000
(
01:10
+0200)
Fixes: 1424/clusterfuzz-testcase-minimized-
6088327159611392
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/lagarith.c
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diff --git
a/libavcodec/lagarith.c
b/libavcodec/lagarith.c
index
469eec4
..
0444977
100644
(file)
--- a/
libavcodec/lagarith.c
+++ b/
libavcodec/lagarith.c
@@
-98,7
+98,7
@@
static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
static uint8_t lag_calc_zero_run(int8_t x)
{
- return (x
<< 1
) ^ (x >> 7);
+ return (x
* 2
) ^ (x >> 7);
}
static int lag_decode_prob(GetBitContext *gb, uint32_t *value)