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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-03 23:42:01 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-07 04:47:32 +0100 |
| commit | 476665d4de989dba48ec1195215ccc8db54538f4 (patch) | |
| tree | 8e755dd4b48692bcb693b747256b2d1b888fc8c9 | |
| parent | 3c0a081a1e9fc4101252af0aeb6be020ecda43ed (diff) | |
| download | ffmpeg-476665d4de989dba48ec1195215ccc8db54538f4.tar.gz | |
avcodec/h264_slice: Do not attempt to render into frames already output
Fixes: null pointer dereference
Fixes: 4698/clusterfuzz-testcase-minimized-5096956322906112
This testcase does not reproduce the issue before 03b82b3ab9883cef017e513c7d0b3b986b3b3e7b
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/h264_slice.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c index aad5484588..e6b7998834 100644 --- a/libavcodec/h264_slice.c +++ b/libavcodec/h264_slice.c @@ -1571,6 +1571,12 @@ static int h264_field_start(H264Context *h, const H264SliceContext *sl, * one except for reference purposes. */ h->first_field = 1; h->cur_pic_ptr = NULL; + } else if (h->cur_pic_ptr->reference & DELAYED_PIC_REF) { + /* This frame was already output, we cannot draw into it + * anymore. + */ + h->first_field = 1; + h->cur_pic_ptr = NULL; } else { /* Second field in complementary pair */ h->first_field = 0; |