[FFmpeg-cvslog] avformat/realtextdec: Check for duplicate extradata in realtext_read_header()
Michael Niedermayer
git at videolan.org
Mon Aug 5 19:02:51 EEST 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug 4 12:21:51 2019 +0200| [652ea23cb34bc59b38c0088865600e2b86079815] | committer: Michael Niedermayer
avformat/realtextdec: Check for duplicate extradata in realtext_read_header()
Fixes: memleak
Fixes: 16140/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5684008052064256
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=652ea23cb34bc59b38c0088865600e2b86079815
---
libavformat/realtextdec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavformat/realtextdec.c b/libavformat/realtextdec.c
index e12871e6ad..204e557aa2 100644
--- a/libavformat/realtextdec.c
+++ b/libavformat/realtextdec.c
@@ -87,6 +87,10 @@ static int realtext_read_header(AVFormatContext *s)
/* save header to extradata */
const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
+ if (st->codecpar->extradata) {
+ res = AVERROR_INVALIDDATA;
+ goto end;
+ }
if (p)
duration = read_ts(p);
st->codecpar->extradata = av_strdup(buf.str);
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