[FFmpeg-devel] [PATCH 05/21] avformat/matroskadec: Fix memleaks on read_header failure

[Andreas Rheinhardt]

This commit simplifies cleanup after read_header failure: By setting the
FF_INPUTFORMAT_HEADER_CLEANUP flag for both the ordinary Matroska demuxer
as well as the WebM DASH Manifest demuxer one can remove the "goto fail"
in matroska_read_header() as well as an explicit matroska_read_close()
in webm_dash_manifest_read_header(); the forward declaration of
matroska_read_close() can also be removed.

For the Matroska demuxer this fixes a memleak when adding an attached
picture fails; for the WebM DASH Manifest demuxer this fixes memleaks
because calling matroska_read_close() has been forgotten on several
error paths.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
---
 libavformat/matroskadec.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 4d7fdab99f..31b0a73660 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -749,8 +749,6 @@ static EbmlSyntax matroska_cluster_enter[] = {
 
 static const char *const matroska_doctypes[] = { "matroska", "webm" };
 
-static int matroska_read_close(AVFormatContext *s);
-
 /*
  * This function prepares the status for parsing of level 1 elements.
  */
@@ -2837,7 +2835,7 @@ static int matroska_read_header(AVFormatContext *s)
     while (res != 1) {
         res = matroska_resync(matroska, pos);
         if (res < 0)
-            goto fail;
+            return res;
         pos = avio_tell(matroska->ctx->pb);
         res = ebml_parse(matroska, matroska_segment, matroska);
     }
@@ -2859,7 +2857,7 @@ static int matroska_read_header(AVFormatContext *s)
 
     res = matroska_parse_tracks(s);
     if (res < 0)
-        goto fail;
+        return res;
 
     attachments = attachments_list->elem;
     for (j = 0; j < attachments_list->nb_elem; j++) {
@@ -2937,9 +2935,6 @@ static int matroska_read_header(AVFormatContext *s)
     matroska_convert_tags(s);
 
     return 0;
-fail:
-    matroska_read_close(s);
-    return res;
 }
 
 /*
@@ -4129,7 +4124,6 @@ static int webm_dash_manifest_read_header(AVFormatContext *s)
         return -1;
     }
     if (!s->nb_streams) {
-        matroska_read_close(s);
         av_log(s, AV_LOG_ERROR, "No streams found\n");
         return AVERROR_INVALIDDATA;
     }
@@ -4200,7 +4194,8 @@ AVInputFormat ff_matroska_demuxer = {
     .read_packet    = matroska_read_packet,
     .read_close     = matroska_read_close,
     .read_seek      = matroska_read_seek,
-    .mime_type      = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
+    .mime_type      = "audio/webm,audio/x-matroska,video/webm,video/x-matroska",
+    .flags_internal = FF_INPUTFORMAT_HEADER_CLEANUP,
 };
 
 AVInputFormat ff_webm_dash_manifest_demuxer = {
@@ -4211,4 +4206,5 @@ AVInputFormat ff_webm_dash_manifest_demuxer = {
     .read_packet    = webm_dash_manifest_read_packet,
     .read_close     = matroska_read_close,
     .priv_class     = &webm_dash_class,
+    .flags_internal = FF_INPUTFORMAT_HEADER_CLEANUP,
 };
-- 
2.20.1