[FFmpeg-devel] [PATCH 1/2] oavformat/avidec_ Check offset in odml
Michael Niedermayer
michael at niedermayer.cc
Sun Sep 19 23:35:35 EEST 2021
Fixes: signed integer overflow: 9223372036854775807 + 8 cannot be represented in type 'long'
Fixes: 38787/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-4859845799444480
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavformat/avidec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 3eb5d4dff5f..1e8efc13060 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -244,7 +244,7 @@ static int read_odml_index(AVFormatContext *s, int64_t frame_num)
avio_rl32(pb); /* size */
duration = avio_rl32(pb);
- if (avio_feof(pb))
+ if (avio_feof(pb) || offset > INT64_MAX - 8)
return AVERROR_INVALIDDATA;
pos = avio_tell(pb);
--
2.17.1
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