rmdec: Pass AVIOContext to rm_read_metadata()

Fix null pointer dereference
Fixes Ticket2588
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rmdec.c

@@ -95,13 +95,14 @@ static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned si
     return 0;
 }
 
-static void rm_read_metadata(AVFormatContext *s, int wide)
+static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)
 {
     char buf[1024];
     int i;
+
     for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
-        int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
-        get_strl(s->pb, buf, sizeof(buf), len);
+        int len = wide ? avio_rb16(pb) : avio_r8(pb);
+        get_strl(pb, buf, sizeof(buf), len);
         av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
     }
 }
@@ -134,7 +135,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
         avio_skip(pb, 8);
         bytes_per_minute = avio_rb16(pb);
         avio_skip(pb, 4);
-        rm_read_metadata(s, 0);
+        rm_read_metadata(s, pb, 0);
         if ((startpos + header_size) >= avio_tell(pb) + 2) {
             // fourcc (should always be "lpcJ")
             avio_r8(pb);
@@ -293,7 +294,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
             avio_r8(pb);
             avio_r8(pb);
             avio_r8(pb);
-            rm_read_metadata(s, 0);
+            rm_read_metadata(s, pb, 0);
         }
     }
     return 0;
@@ -516,7 +517,7 @@ static int rm_read_header(AVFormatContext *s)
             flags = avio_rb16(pb); /* flags */
             break;
         case MKTAG('C', 'O', 'N', 'T'):
-            rm_read_metadata(s, 1);
+            rm_read_metadata(s, pb, 1);
             break;
         case MKTAG('M', 'D', 'P', 'R'):
             st = avformat_new_stream(s, NULL);