[FFmpeg-cvslog] avformat/4xm: Consider max_streams on reallocating tracks array
Michael Niedermayer
git at videolan.org
Wed Apr 6 22:55:27 EEST 2022
ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Tue Dec 7 09:14:08 2021 +0100| [75befad4c0d71a0df6b61356db1bc0fc81f8c079] | committer: Michael Niedermayer
avformat/4xm: Consider max_streams on reallocating tracks array
Fixes: OOM
Fixes: 41595/clusterfuzz-testcase-minimized-ffmpeg_dem_FOURXM_fuzzer-6355979363549184
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 0dcd95ef8a2e16ed930296567ab1044e33602a34)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=75befad4c0d71a0df6b61356db1bc0fc81f8c079
---
libavformat/4xm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index 30f1b05324..9dc4f05d3b 100644
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -137,7 +137,8 @@ static int parse_strk(AVFormatContext *s,
return AVERROR_INVALIDDATA;
track = AV_RL32(buf + 8);
- if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) {
+ if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1 ||
+ track >= s->max_streams) {
av_log(s, AV_LOG_ERROR, "current_track too large\n");
return AVERROR_INVALIDDATA;
}
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