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avformat/wavdec: Check if there are 16 bytes before testing them

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Fixes: use-of-uninitialized-value
Fixes: 70839/clusterfuzz-testcase-minimized-ffmpeg_dem_W64_fuzzer-5212907590189056

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 79a1cf30d1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-08-03 19:45:15 +02:00
parent f6adefd4cd
commit b66ada8ae5
1 changed files with 1 additions and 2 deletions
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libavformat/wavdec.c
+1 -2
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@@ -791,8 +791,7 @@ static int w64_read_header(AVFormatContext *s)
uint8_t guid[16];
int ret;
avio_read(pb, guid, 16);
if (memcmp(guid, ff_w64_guid_riff, 16))
if (avio_read(pb, guid, 16) != 16 || memcmp(guid, ff_w64_guid_riff, 16))
return AVERROR_INVALIDDATA;
/* riff + wave + fmt + sizes */