diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-10-16 19:05:23 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-09 13:37:21 +0200 |
| commit | d7fd7eb2974f6bb5ef8db7e1ee6404345267f83d (patch) | |
| tree | f674d7862c0860044389f61719ce2987fb85cd19 | |
| parent | 8bcad00e41869840aaf55dc52cff252671dbb8c0 (diff) | |
| download | ffmpeg-d7fd7eb2974f6bb5ef8db7e1ee6404345267f83d.tar.gz | |
avformat/icodec: Change order of operations to avoid NULL dereference
Fixes: SEGV on unknown address 0x000000000000
Fixes: 26379/clusterfuzz-testcase-minimized-ffmpeg_dem_ICO_fuzzer-5709011753893888
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3300f5c133650ba25f94531d40ecc94c79b84457)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/icodec.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libavformat/icodec.c b/libavformat/icodec.c index 00c03d409c..59e5416116 100644 --- a/libavformat/icodec.c +++ b/libavformat/icodec.c @@ -156,12 +156,14 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt) IcoDemuxContext *ico = s->priv_data; IcoImage *image; AVIOContext *pb = s->pb; - AVStream *st = s->streams[0]; + AVStream *st; int ret; if (ico->current_image >= ico->nb_images) return AVERROR_EOF; + st = s->streams[0]; + image = &ico->images[ico->current_image]; if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0) |