[FFmpeg-cvslog] avcodec/cinepak: Skip empty frames
Michael Niedermayer
git at videolan.org
Tue Jul 10 12:04:44 EEST 2018
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Tue Apr 17 02:13:43 2018 +0200| [bd7231cad119894d79c4f05c2e5471caee66d197] | committer: Michael Niedermayer
avcodec/cinepak: Skip empty frames
Speeds up decoding from 3 to 0.1 seconds for 6302/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CINEPAK_fuzzer-5626371985375232
Fixes: Timeout
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 9033920bec9ccf17de205fc17c2b330906b200f5)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bd7231cad119894d79c4f05c2e5471caee66d197
---
libavcodec/cinepak.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/libavcodec/cinepak.c b/libavcodec/cinepak.c
index 908c248ef0..9060e31fb1 100644
--- a/libavcodec/cinepak.c
+++ b/libavcodec/cinepak.c
@@ -444,6 +444,7 @@ static int cinepak_decode_frame(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int ret = 0, buf_size = avpkt->size;
CinepakContext *s = avctx->priv_data;
+ int num_strips;
s->data = buf;
s->size = buf_size;
@@ -451,6 +452,12 @@ static int cinepak_decode_frame(AVCodecContext *avctx,
if (s->size < 10)
return AVERROR_INVALIDDATA;
+ num_strips = AV_RB16 (&s->data[8]);
+
+ //Empty frame, do not waste time
+ if (!num_strips && (!s->palette_video || !av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL)))
+ return buf_size;
+
if ((ret = cinepak_predecode_check(s)) < 0) {
av_log(avctx, AV_LOG_ERROR, "cinepak_predecode_check failed\n");
return ret;
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