[FFmpeg-cvslog] lavf/sr: fix the segmentation fault caused by incorrect input frame free.

[Ting Fu]

ffmpeg | branch: master | Ting Fu <ting.fu-at-intel.com at ffmpeg.org> | Mon Jun 27 18:02:30 2022 +0800| [130d19bf2044ac76372d1b97ab87ab283c8b37f8] | committer: Guo Yejun

lavf/sr: fix the segmentation fault caused by incorrect input frame free.

This issue would cause segmetaion fault when running srcnn model with
sr filter by TensorFlow backend. This filter would free the frame incorectly.

Signed-off-by: Ting Fu <ting.fu at intel.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=130d19bf2044ac76372d1b97ab87ab283c8b37f8
---

 libavfilter/vf_sr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavfilter/vf_sr.c b/libavfilter/vf_sr.c
index 0890c8ba18..cb24c096ce 100644
--- a/libavfilter/vf_sr.c
+++ b/libavfilter/vf_sr.c
@@ -159,8 +159,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         sws_scale(ctx->sws_uv_scale, (const uint8_t **)(in->data + 2), in->linesize + 2,
                   0, ctx->sws_uv_height, out->data + 2, out->linesize + 2);
     }
-
-    av_frame_free(&in);
+    if (in != out) {
+        av_frame_free(&in);
+    }
     return ff_filter_frame(outlink, out);
 }