[FFmpeg-cvslog] avcodec/mxpegdec: Fix memleaks upon init failure

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Thu Nov 26 22:16:13 2020 +0100| [9de6688cc4216381e155a5b3f7d88c26806db93d] | committer: Andreas Rheinhardt

avcodec/mxpegdec: Fix memleaks upon init failure

Reviewed-by: Anton Khirnov <anton at khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9de6688cc4216381e155a5b3f7d88c26806db93d
---

 libavcodec/mjpegdec.c | 2 ++
 libavcodec/mxpegdec.c | 6 ++----
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 6cf8014490..c2d946752e 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -2815,6 +2815,8 @@ the_end_no_picture:
     return buf_ptr - buf;
 }
 
+/* mxpeg may call the following function (with a blank MJpegDecodeContext)
+ * even without having called ff_mjpeg_decode_init(). */
 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
 {
     MJpegDecodeContext *s = avctx->priv_data;
diff --git a/libavcodec/mxpegdec.c b/libavcodec/mxpegdec.c
index 55ec6e928e..725e435118 100644
--- a/libavcodec/mxpegdec.c
+++ b/libavcodec/mxpegdec.c
@@ -67,10 +67,8 @@ static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
 
     s->picture[0] = av_frame_alloc();
     s->picture[1] = av_frame_alloc();
-    if (!s->picture[0] || !s->picture[1]) {
-        mxpeg_decode_end(avctx);
+    if (!s->picture[0] || !s->picture[1])
         return AVERROR(ENOMEM);
-    }
 
     s->jpg.picture_ptr      = s->picture[0];
     return ff_mjpeg_decode_init(avctx);
@@ -351,5 +349,5 @@ AVCodec ff_mxpeg_decoder = {
     .decode         = mxpeg_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
     .max_lowres     = 3,
-    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };