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avformat/wavdec: Check if there are 16 bytes before testing them
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>
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@ -874,8 +874,7 @@ static int w64_read_header(AVFormatContext *s)
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uint8_t guid[16];
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int ret;
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avio_read(pb, guid, 16);
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if (memcmp(guid, ff_w64_guid_riff, 16))
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if (avio_read(pb, guid, 16) != 16 || memcmp(guid, ff_w64_guid_riff, 16))
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return AVERROR_INVALIDDATA;
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/* riff + wave + fmt + sizes */
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