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rmdec: Use the AVIOContext given as parameter in rm_read_metadata() 

This fixes crashes when playing back certain RealRTSP streams.

When invoked from the RTP depacketizer, the full realmedia
demuxer isn't invoked, but only certain functions from it, where
a separate AVIOContext is passed in as parameter (for the buffer
containing the data to parse). The functions called from within
those entry points should only be using that parameter, not
s->pb. In the depacketizer case, s is the RTSP context, where ->pb
is null.

Cc: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Michael Niedermayer 2013-07-01 23:38:08 +02:00 committed by Martin Storsjö
parent 5d876be87a
commit d35b6cd377
1 changed files with 6 additions and 6 deletions
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12
libavformat/rmdec.c
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@ -93,13 +93,13 @@ 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);
}
}
@ -129,7 +129,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
int header_size = avio_rb16(pb);
int64_t startpos = avio_tell(pb);
avio_skip(pb, 14);
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);
@ -276,7 +276,7 @@ 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;
@ -468,7 +468,7 @@ 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);