[FFmpeg-devel] [PATCH 05/23] avformat/matroskaenc: Check functions that can fail

[Andreas Rheinhardt]

Sometimes it has not been checked whether opening the dynamic buffer for
writing tags fails; this might have led to segfaults.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
---
 libavformat/matroskaenc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 179349690d..274f62dd78 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1552,7 +1552,9 @@ static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
         ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
         if (ret < 0) return ret;
 
-        start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS);
+        ret = start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS);
+        if (ret < 0)
+            return ret;
     }
     pb = mkv->tags_bc;
 
@@ -1650,8 +1652,10 @@ static int mkv_write_tags(AVFormatContext *s)
             if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
                 continue;
 
-            mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID,
-                                  track->uid, &tag_target);
+            ret = mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID,
+                                        track->uid, &tag_target);
+            if (ret < 0)
+                return ret;
             pb = mkv->tags_bc;
 
             tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
-- 
2.20.1