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avformat/microdvddec: Fix memleak upon read header failure 

The already parsed subtitles (contained in an FFDemuxSubtitlesQueue)
would leak if an error happened upon reading a subsequent subtitle
or when allocating extradata.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-06-14 03:16:15 +02:00
parent d38694cea9
commit b12014a5b8
1 changed files with 10 additions and 5 deletions
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15
libavformat/microdvddec.c
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@ -81,7 +81,7 @@ static int microdvd_read_header(AVFormatContext *s)
AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */
MicroDVDContext *microdvd = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
int i = 0;
int i = 0, ret;
char line_buf[MAX_LINESIZE];
int has_real_fps = 0;
@ -117,10 +117,10 @@ static int microdvd_read_header(AVFormatContext *s)
continue;
}
if (!st->codecpar->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
int ret, size = strlen(line + 11);
int size = strlen(line + 11);
ret = ff_alloc_extradata(st->codecpar, size);
if (ret < 0)
return ret;
goto fail;
memcpy(st->codecpar->extradata, line + 11, size);
continue;
}
@ -138,8 +138,10 @@ static int microdvd_read_header(AVFormatContext *s)
if (!*p)
continue;
sub = ff_subtitles_queue_insert(&microdvd->q, p, strlen(p), 0);
if (!sub)
return AVERROR(ENOMEM);
if (!sub) {
ret = AVERROR(ENOMEM);
goto fail;
}
sub->pos = pos;
sub->pts = get_pts(line);
sub->duration = get_duration(line);
@ -156,6 +158,9 @@ static int microdvd_read_header(AVFormatContext *s)
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_MICRODVD;
return 0;
fail:
ff_subtitles_queue_clean(&microdvd->q);
return ret;
}
static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)