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avcodec/dstdec: Use get_ur_golomb_jpegls() 

Fixes: shift exponent -4 is negative
Fixes: 17793/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DST_fuzzer-5766088435957760
Fixes: 18989/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DST_fuzzer-5175008116867072

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 2019-10-01 00:43:03 +02:00
parent 19c41969b2
commit a76690c02b
1 changed files with 1 additions and 1 deletions
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libavcodec/dstdec.c
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@ -121,7 +121,7 @@ static int read_map(GetBitContext *gb, Table *t, unsigned int map[DST_MAX_CHANNE
static av_always_inline int get_sr_golomb_dst(GetBitContext *gb, unsigned int k)
{
int v = get_ur_golomb(gb, k, get_bits_left(gb), 0);
int v = get_ur_golomb_jpegls(gb, k, get_bits_left(gb), 0);
if (v && get_bits1(gb))
v = -v;
return v;