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avformat/nsvdec: Fix memleaks on errors while reading the header 

Fixes: memleaks
Fixes: 21084/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5655975492321280

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-03-18 20:20:44 +01:00
parent 3197b0099b
commit 96c0469455
1 changed files with 14 additions and 6 deletions
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20
libavformat/nsvdec.c
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@ -211,6 +211,7 @@ static const AVCodecTag nsv_codec_audio_tags[] = {
//static int nsv_load_index(AVFormatContext *s);
static int nsv_read_chunk(AVFormatContext *s, int fill_header);
static int nsv_read_close(AVFormatContext *s);
/* try to find something we recognize, and set the state accordingly */
static int nsv_resync(AVFormatContext *s)
@ -492,25 +493,32 @@ static int nsv_read_header(AVFormatContext *s)
nsv->ahead[0].data = nsv->ahead[1].data = NULL;
for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
if (nsv_resync(s) < 0)
return -1;
err = nsv_resync(s);
if (err < 0)
goto fail;
if (nsv->state == NSV_FOUND_NSVF) {
err = nsv_parse_NSVf_header(s);
if (err < 0)
return err;
goto fail;
}
/* we need the first NSVs also... */
if (nsv->state == NSV_FOUND_NSVS) {
err = nsv_parse_NSVs_header(s);
if (err < 0)
return err;
goto fail;
break; /* we just want the first one */
}
}
if (s->nb_streams < 1) /* no luck so far */
return -1;
if (s->nb_streams < 1) { /* no luck so far */
err = AVERROR_INVALIDDATA;
goto fail;
}
/* now read the first chunk, so we can attempt to decode more info */
err = nsv_read_chunk(s, 1);
fail:
if (err < 0)
nsv_read_close(s);
av_log(s, AV_LOG_TRACE, "parsed header\n");
return err;