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avformat/mov: make sure file_checksum is fully initialized

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Fixes: use of uninitialized memory
Fixes: 394990189/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6431722199908352

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 8b16e1ddd9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-07-23 13:16:33 +02:00
parent 5339f20be2
commit e3d695473d
1 changed files with 3 additions and 1 deletions
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libavformat/mov.c
+3 -1
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@@ -1018,7 +1018,9 @@ static int mov_read_adrm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
avio_read(pb, output, 8); // go to offset 8, absolute position 0x251
avio_read(pb, input, DRM_BLOB_SIZE);
avio_read(pb, output, 4); // go to offset 4, absolute position 0x28d
avio_read(pb, file_checksum, 20);
ret = ffio_read_size(pb, file_checksum, 20);
if (ret < 0)
goto fail;
av_log(c->fc, AV_LOG_INFO, "[aax] file checksum == "); // required by external tools
for (i = 0; i < 20; i++)