[FFmpeg-devel] [PATCH 2/3] avcodec/alsdec: Fix undefined behavior in decode_rice()
Michael Niedermayer
michael at niedermayer.cc
Thu Jun 20 00:54:21 EEST 2019
Fixes: left shift of 72 by 26 places cannot be represented in type 'int'
Fixes: 15279/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5700665621348352
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavcodec/alsdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index da6285cab0..b7ce5c7844 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -487,7 +487,7 @@ static void parse_bs_info(const uint32_t bs_info, unsigned int n,
static int32_t decode_rice(GetBitContext *gb, unsigned int k)
{
int max = get_bits_left(gb) - k;
- int q = get_unary(gb, 0, max);
+ unsigned q = get_unary(gb, 0, max);
int r = k ? get_bits1(gb) : !(q & 1);
if (k > 1) {
--
2.22.0
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