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avcodec/alsdec: Fix undefined behavior in decode_rice() 

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@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-19 23:17:31 +02:00
parent e131568752
commit 51f6870c37
1 changed files with 1 additions and 1 deletions
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libavcodec/alsdec.c
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@ -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) static int32_t decode_rice(GetBitContext *gb, unsigned int k)
{ {
int max = get_bits_left(gb) - 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); int r = k ? get_bits1(gb) : !(q & 1);
if (k > 1) { if (k > 1) {