[FFmpeg-cvslog] avcodec/cook: Use 3 stage VLC decoding for channel_coupling

Michael Niedermayer git at videolan.org
Tue Dec 31 20:05:10 EET 2019


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Nov 25 21:39:48 2019 +0100| [89fd76db71d9d4f87c51fee2a2edf99662444df7] | committer: Michael Niedermayer

avcodec/cook: Use 3 stage VLC decoding for channel_coupling

Fixes: shift exponent -1 is negative
Fixes: out of array read
Fixes: 19028/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_COOK_fuzzer-5759766471376896
Fixes: 19037/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_COOK_fuzzer-5734106625474560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=89fd76db71d9d4f87c51fee2a2edf99662444df7
---

 libavcodec/cook.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/cook.c b/libavcodec/cook.c
index 248e59256f..d0b41a2431 100644
--- a/libavcodec/cook.c
+++ b/libavcodec/cook.c
@@ -759,7 +759,7 @@ static int decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab)
         for (i = 0; i < length; i++)
             decouple_tab[start + i] = get_vlc2(&q->gb,
                                                p->channel_coupling.table,
-                                               p->channel_coupling.bits, 2);
+                                               p->channel_coupling.bits, 3);
     else
         for (i = 0; i < length; i++) {
             int v = get_bits(&q->gb, p->js_vlc_bits);



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