[FFmpeg-cvslog] avcodec/cbs_h2645: Skip all 0 NAL units

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Dec 11 19:19:49 2019 +0100| [285138ef14327ec71f356e3a923c4adde0874dc6] | committer: Michael Niedermayer

avcodec/cbs_h2645: Skip all 0 NAL units

Fixes: assertion failure
Fixes: 19286/clusterfuzz-testcase-minimized-ffmpeg_BSF_H264_REDUNDANT_PPS_fuzzer-5707990724509696

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=285138ef14327ec71f356e3a923c4adde0874dc6
---

 libavcodec/cbs_h2645.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index 5f71d80584..ad8afa6d4a 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -568,7 +568,10 @@ static int cbs_h2645_fragment_add_nals(CodedBitstreamContext *ctx,
         // Remove trailing zeroes.
         while (size > 0 && nal->data[size - 1] == 0)
             --size;
-        av_assert0(size > 0);
+        if (size == 0) {
+            av_log(ctx->log_ctx, AV_LOG_VERBOSE, "Discarding empty 0 NAL unit\n");
+            continue;
+        }
 
         ref = (nal->data == nal->raw_data) ? frag->data_ref
                                            : packet->rbsp.rbsp_buffer_ref;