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avformat/apetag: Check APETAGEX

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Fixes: Use of uninitialized value
Fixes: 71074/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-5697034877730816

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 796ff2d599)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-08-19 17:02:12 +02:00
parent 50740973ec
commit bdda29b4c4
1 changed files with 2 additions and 1 deletions
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3
libavformat/apetag.c
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@@ -129,7 +129,8 @@ int64_t ff_ape_parse_tag(AVFormatContext *s)
avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
avio_read(pb, buf, 8); /* APETAGEX */
if(avio_read(pb, buf, 8) != 8) /* APETAGEX */
return 0;
if (strncmp(buf, APE_TAG_PREAMBLE, 8)) {
return 0;
}