[FFmpeg-cvslog] avcodec/pngdec: Clean up on av_frame_ref() failure

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Sep 17 02:42:11 2017 +0200| [bf6cd808bed4060de3d30c729cc29feee5d6f47a] | committer: Michael Niedermayer

avcodec/pngdec: Clean up on av_frame_ref() failure

Fixes: memleak
Fixes: 3203/clusterfuzz-testcase-minimized-4514553595428864

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 5480e82d77770e81e897a8c217f3c7f0c13a6de1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bf6cd808bed4060de3d30c729cc29feee5d6f47a
---

 libavcodec/pngdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index c2359b8a4d..67a6e3f9d0 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -1366,7 +1366,7 @@ static int decode_frame_png(AVCodecContext *avctx,
     }
 
     if ((ret = av_frame_ref(data, s->picture.f)) < 0)
-        return ret;
+        goto the_end;
 
     *got_frame = 1;