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>

diff --git a/libavcodec/dstdec.c b/libavcodec/dstdec.c
index ae3fe428ddba0d76c0375b6b5e1bd966530917e4..880b838b0cec70641f7204eb18d093f055993ab3 100644 (file)
--- a/libavcodec/dstdec.c
+++ b/libavcodec/dstdec.c
@@ -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;