[FFmpeg-cvslog] avfilter/vf_dnn_classify: add result check for av_frame_get_side_data

[Steven Liu]

ffmpeg | branch: master | Steven Liu <liuqi05 at kuaishou.com> | Fri May  7 14:42:48 2021 +0800| [7ce0f246f48459a65aedeabce58afdaa988d0eaf] | committer: Guo, Yejun

avfilter/vf_dnn_classify: add result check for av_frame_get_side_data

CID: 1482090
there can return null from av_frame_get_side_data, and will use sd->data
after av_frame_get_side_data, so should check null return value.

Signed-off-by: Steven Liu <liuqi05 at kuaishou.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7ce0f246f48459a65aedeabce58afdaa988d0eaf
---

 libavfilter/vf_dnn_classify.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavfilter/vf_dnn_classify.c b/libavfilter/vf_dnn_classify.c
index 18fcd452d0..7900255cfe 100644
--- a/libavfilter/vf_dnn_classify.c
+++ b/libavfilter/vf_dnn_classify.c
@@ -77,6 +77,10 @@ static int dnn_classify_post_proc(AVFrame *frame, DNNData *output, uint32_t bbox
     }
 
     sd = av_frame_get_side_data(frame, AV_FRAME_DATA_DETECTION_BBOXES);
+    if (!sd) {
+        av_log(filter_ctx, AV_LOG_ERROR, "Cannot get side data in dnn_classify_post_proc\n");
+        return -1;
+    }
     header = (AVDetectionBBoxHeader *)sd->data;
 
     if (bbox_index == 0) {