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avformat/bethsoftvid: Check image dimensions before use

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Fixes: signed integer overflow: 55255 * 53207 cannot be represented in type 'int'
Fixes: 26387/clusterfuzz-testcase-minimized-ffmpeg_dem_AVS2_fuzzer-5684222226071552

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 50b29f081e9620dc39727adef707c2c323a8c095)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-17 22:19:58 +02:00
parent bbb50c5d0b
commit e3f8b914d1
1 changed files with 6 additions and 0 deletions
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6
libavformat/bethsoftvid.c
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@ -28,6 +28,7 @@
*/
#include "libavutil/channel_layout.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
@ -72,6 +73,7 @@ static int vid_read_header(AVFormatContext *s)
{
BVID_DemuxContext *vid = s->priv_data;
AVIOContext *pb = s->pb;
int ret;
/* load main header. Contents:
* bytes: 'V' 'I' 'D'
@ -84,6 +86,10 @@ static int vid_read_header(AVFormatContext *s)
vid->bethsoft_global_delay = avio_rl16(pb);
avio_rl16(pb);
ret = av_image_check_size(vid->width, vid->height, 0, s);
if (ret < 0)
return ret;
// wait until the first packet to create each stream
vid->video_index = -1;
vid->audio_index = -1;