[FFmpeg-cvslog] avformat/mov: Check for EOF in mov_read_glbl()

Michael Niedermayer git at videolan.org
Mon Apr 18 19:05:51 EEST 2022


ffmpeg | branch: release/3.2 | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec  4 20:11:35 2021 +0100| [8e09257dcaae88f956fb37347b4eeafd12ab4f07] | committer: Michael Niedermayer

avformat/mov: Check for EOF in mov_read_glbl()

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>
(cherry picked from commit 59b4e7cbd87889c0bac710ac7f62782b637419a1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8e09257dcaae88f956fb37347b4eeafd12ab4f07
---

 libavformat/mov.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 6d18ceccbd..fde2a856ef 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1672,6 +1672,8 @@ 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);



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