[FFmpeg-devel] [PATCH 1/4] avformat/mov: Check for EOF in mov_read_glbl()
Michael Niedermayer
michael at niedermayer.cc
Sat Dec 4 23:32:55 EET 2021
Fixes: Infinite loop
Fixes: 41351/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5433895854669824
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/mov.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index e34453432d3..ff5a55d0e62 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1930,6 +1930,8 @@ static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
// wrap a whole fiel atom inside of a glbl atom.
unsigned size = avio_rb32(pb);
unsigned type = avio_rl32(pb);
+ if (avio_feof(pb))
+ return AVERROR_INVALIDDATA;
avio_seek(pb, -8, SEEK_CUR);
if (type == MKTAG('f','i','e','l') && size == atom.size)
return mov_read_default(c, pb, atom);
--
2.17.1
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