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avformat/realtextdec: Check for duplicate extradata in realtext_read_header()

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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@niedermayer.cc>
(cherry picked from commit 652ea23cb34bc59b38c0088865600e2b86079815)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-04 12:21:51 +02:00
parent 1bfaa22889
commit c3b4278b01
1 changed files with 4 additions and 0 deletions
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4
libavformat/realtextdec.c
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@ -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);