[FFmpeg-trac] #11589(avcodec:new): null check for AVSideDataDescriptor* in ffmpeg_enc.c

[FFmpeg]

#11589: null check for AVSideDataDescriptor* in ffmpeg_enc.c
-------------------------------------+----------------------------------
             Reporter:  uttam_32472  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  7.1
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+----------------------------------
 ffmpeg_enc.c is accessing the struct member without null check.
             const AVSideDataDescriptor *desc =
 av_frame_side_data_desc(frame->side_data[i]->type);
             if (!(desc->props & AV_SIDE_DATA_PROP_GLOBAL))
 https://github.com/FFmpeg/FFmpeg/blob/4991c1ec92874737a9c4b1bce1b3f73a23b78b20/fftools/ffmpeg_enc.c#L191

 Above code can crash if the given sidedata type entry is not present in
 https://github.com/FFmpeg/FFmpeg/blob/4991c1ec92874737a9c4b1bce1b3f73a23b78b20/libavutil/frame.c#L31C1-L61C3

 There are null checks present in https://github.com/Xilinx-
 Projects/ma35_ffmpeg/blob/develop/src/libavutil/frame.c for the return
 value of av_frame_side_data_desc() and same should be with ffmpeg_enc.c as
 well.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11589>
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