demux_mf: fix crashes when '*' matches directories

Doing 'mpv mf://*' in a file with directories would crash, because even
though directories are skipped, the corresponding file entry is just
left at NULL, leading to a segfault on access. So explicitly skip NULL
entries.

2 files changed, 10 insertions, 7 deletions

diff --git a/demux/demux_mf.c b/demux/demux_mf.c
index 236718de36..0db3fb8add 100644
--- a/demux/demux_mf.c
+++ b/demux/demux_mf.c
@@ -70,8 +70,11 @@ static int demux_mf_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds){
     if (mf->streams)
         entry_stream = mf->streams[mf->curr_frame];
     struct stream *stream = entry_stream;
-    if (!stream)
-        stream = open_stream(mf->names[mf->curr_frame], demuxer->opts, NULL);
+    if (!stream) {
+        char *filename = mf->names[mf->curr_frame];
+        if (filename)
+            stream = open_stream(filename, demuxer->opts, NULL);
+    }
 
     if (stream) {
         stream_seek(stream, 0);
@@ -87,7 +90,7 @@ static int demux_mf_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds){
         talloc_free(data.start);
     }
 
-    if (stream != entry_stream)
+    if (stream && stream != entry_stream)
         free_stream(stream);
 
     mf->curr_frame++;
diff --git a/demux/mf.c b/demux/mf.c
index 98fab6edc4..21c3fad186 100644
--- a/demux/mf.c
+++ b/demux/mf.c
@@ -128,18 +128,18 @@ mf_t* open_mf_pattern(char * filename)
    if ( glob( fname,0,NULL,&gg ) )
     { free( mf ); free( fname ); return NULL; }
 
-   mf->nr_of_files=gg.gl_pathc;
+   mf->nr_of_files=0;
    mf->names=calloc( gg.gl_pathc, sizeof( char* ) );
 
-   mp_msg( MSGT_STREAM,MSGL_INFO,"[mf] number of files: %d (%zd)\n",mf->nr_of_files, gg.gl_pathc * sizeof( char* ) );
-
    for( i=0;i < gg.gl_pathc;i++ )
     {
      if (mp_path_isdir(gg.gl_pathv[i]))
        continue;
-     mf->names[i]=strdup( gg.gl_pathv[i] );
+     mf->names[mf->nr_of_files]=strdup( gg.gl_pathv[i] );
+     mf->nr_of_files++;
 //     mp_msg( MSGT_STREAM,MSGL_DBG2,"[mf] added file %d.: %s\n",i,mf->names[i] );
     }
+   mp_msg( MSGT_STREAM,MSGL_INFO,"[mf] number of files: %d\n",mf->nr_of_files);
    globfree( &gg );
    goto exit_mf;
   }