From cdbdfdf8044b6a884437f82b7777e943491b94cb Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Thu, 4 Apr 2024 00:38:20 +0200
Subject: [PATCH] avformat/mxfdec: Check index_edit_rate
Fixes: Assertion b >=0 failed at libavutil/mathematics.c:62
Fixes: 67811/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-5108429687422976
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 ed49391961999f028e0bc55767d0eef6eeb15e49)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavformat/mxfdec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index f0d141f10b..5c7acb5d00 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -1249,6 +1249,9 @@ static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int
case 0x3F0B:
segment->index_edit_rate.num = avio_rb32(pb);
segment->index_edit_rate.den = avio_rb32(pb);
+ if (segment->index_edit_rate.num <= 0 ||
+ segment->index_edit_rate.den <= 0)
+ return AVERROR_INVALIDDATA;
av_log(NULL, AV_LOG_TRACE, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,
segment->index_edit_rate.den);
break;