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avformat/utils: Fix memleak when decoding subtitle in find_stream_info

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avformat_find_stream_info() may decode some frames to get stream
information. And when it does this for subtitles, the decoded subtitles
leak.

(Decoding subtitles was added in b1511e00f6
for PGS subtitles. When PGS subtitles originate from a container that
exports every segment as a packet of its own, no output will be
generated when decoding a packet, because not enough input is available.
Yet when used with PGS subtitles in the Matroska form a single packet
contains enough data to generate output. Yet said output is not freed,
hence this leak.)

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-04-18 21:36:09 +02:00
parent ee593bff98
commit d026fef999
1 changed files with 2 additions and 0 deletions
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2
libavformat/utils.c
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@ -3126,6 +3126,8 @@ static int try_decode_frame(AVFormatContext *s, AVStream *st,
} else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
ret = avcodec_decode_subtitle2(avctx, &subtitle,
&got_picture, &pkt);
if (got_picture)
avsubtitle_free(&subtitle);
if (ret >= 0)
pkt.size = 0;
}