[FFmpeg-cvslog] avformat/webmdashenc: Fix segfault when no filename is given when live

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Tue Jul 14 22:49:15 2020 +0200| [c1fab8637e4bd9e0f09ae31247b709a22dafa440] | committer: Andreas Rheinhardt

avformat/webmdashenc: Fix segfault when no filename is given when live

by checking a bit earlier.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c1fab8637e4bd9e0f09ae31247b709a22dafa440
---

 libavformat/webmdashenc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libavformat/webmdashenc.c b/libavformat/webmdashenc.c
index eb286cab99..3eefd6df8b 100644
--- a/libavformat/webmdashenc.c
+++ b/libavformat/webmdashenc.c
@@ -171,8 +171,7 @@ static int write_representation(AVFormatContext *s, AVStream *stream, char *id,
     AVDictionaryEntry *filename = av_dict_get(stream->metadata, FILENAME, NULL, 0);
     AVDictionaryEntry *bandwidth = av_dict_get(stream->metadata, BANDWIDTH, NULL, 0);
     const char *bandwidth_str;
-    if ((w->is_live && (!filename)) ||
-        (!w->is_live && (!irange || !cues_start || !cues_end || !filename || !bandwidth))) {
+    if (!w->is_live && (!irange || !cues_start || !cues_end || !filename || !bandwidth)) {
         return AVERROR_INVALIDDATA;
     }
     avio_printf(s->pb, "<Representation id=\"%s\"", id);
@@ -380,7 +379,10 @@ static int write_adaptation_set(AVFormatContext *s, int as_index)
             av_dict_get(s->streams[as->streams[0]]->metadata, FILENAME, NULL, 0);
         char *initialization_pattern = NULL;
         char *media_pattern = NULL;
-        int ret = parse_filename(filename->value, NULL, &initialization_pattern,
+        int ret;
+        if (!filename)
+            return AVERROR(EINVAL);
+        ret = parse_filename(filename->value, NULL, &initialization_pattern,
                                  &media_pattern);
         if (ret) return ret;
         avio_printf(s->pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",