[FFmpeg-devel] [PATCH v2] avcodec/v4l2_m2m: Adapt to call close() on init fail

[Andriy Gelman]

From: Andriy Gelman <andriy.gelman at gmail.com>

This fixes several mem leaks when init of encoder/decoder failed.

Fixes ticket #8285

Signed-off-by: Andriy Gelman <andriy.gelman at gmail.com>
---

 Changes in v2:
  - Use FF_CODEC_CAP_INIT_CLEANUP

 This patch supersedes:
 https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200310045541.13048-1-andriy.gelman@gmail.com/
 https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200310045541.13048-2-andriy.gelman@gmail.com/

 libavcodec/v4l2_m2m.c     |  8 ++++++++
 libavcodec/v4l2_m2m_dec.c | 10 ++--------
 libavcodec/v4l2_m2m_enc.c |  2 ++
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/libavcodec/v4l2_m2m.c b/libavcodec/v4l2_m2m.c
index e48b3a8ccf..bfea70ff0c 100644
--- a/libavcodec/v4l2_m2m.c
+++ b/libavcodec/v4l2_m2m.c
@@ -338,6 +338,13 @@ int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv)
     V4L2m2mContext *s = priv->context;
     int ret;
 
+    if (!s)
+        return 0;
+
+    if (av_codec_is_decoder(s->avctx->codec))
+        av_packet_unref(&s->buf_pkt);
+
+    if (s->fd >= 0) {
     ret = ff_v4l2_context_set_status(&s->output, VIDIOC_STREAMOFF);
     if (ret)
         av_log(s->avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->output.name);
@@ -345,6 +352,7 @@ int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv)
     ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF);
     if (ret)
         av_log(s->avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->capture.name);
+    }
 
     ff_v4l2_context_release(&s->output);
 
diff --git a/libavcodec/v4l2_m2m_dec.c b/libavcodec/v4l2_m2m_dec.c
index 3e17e0fcac..a2ea0ff73a 100644
--- a/libavcodec/v4l2_m2m_dec.c
+++ b/libavcodec/v4l2_m2m_dec.c
@@ -212,9 +212,6 @@ static av_cold int v4l2_decode_init(AVCodecContext *avctx)
     ret = ff_v4l2_m2m_codec_init(priv);
     if (ret) {
         av_log(avctx, AV_LOG_ERROR, "can't configure decoder\n");
-        s->self_ref = NULL;
-        av_buffer_unref(&priv->context_ref);
-
         return ret;
     }
 
@@ -223,10 +220,7 @@ static av_cold int v4l2_decode_init(AVCodecContext *avctx)
 
 static av_cold int v4l2_decode_close(AVCodecContext *avctx)
 {
-    V4L2m2mPriv *priv = avctx->priv_data;
-    V4L2m2mContext *s = priv->context;
-    av_packet_unref(&s->buf_pkt);
-    return ff_v4l2_m2m_codec_end(priv);
+    return ff_v4l2_m2m_codec_end(avctx->priv_data);
 }
 
 #define OFFSET(x) offsetof(V4L2m2mPriv, x)
@@ -261,7 +255,7 @@ static const AVOption options[] = {
         .close          = v4l2_decode_close, \
         .bsfs           = bsf_name, \
         .capabilities   = AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AVOID_PROBING, \
-        .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS, \
+        .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS | FF_CODEC_CAP_INIT_CLEANUP, \
         .wrapper_name   = "v4l2m2m", \
     }
 
diff --git a/libavcodec/v4l2_m2m_enc.c b/libavcodec/v4l2_m2m_enc.c
index 8454e2326c..97c937fdf9 100644
--- a/libavcodec/v4l2_m2m_enc.c
+++ b/libavcodec/v4l2_m2m_enc.c
@@ -25,6 +25,7 @@
 #include <sys/ioctl.h>
 #include <search.h>
 #include "libavcodec/avcodec.h"
+#include "libavcodec/internal.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/pixfmt.h"
 #include "libavutil/opt.h"
@@ -391,6 +392,7 @@ static const AVOption options[] = {
         .receive_packet = v4l2_receive_packet, \
         .close          = v4l2_encode_close, \
         .capabilities   = AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_DELAY, \
+        .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP, \
         .wrapper_name   = "v4l2m2m", \
     };
 
-- 
2.25.1