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avformat/dhav: Check amount read
Prevents potential use of uninitialized data in the following memcmp(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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@ -278,7 +278,9 @@ static int dhav_read_header(AVFormatContext *s)
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if (ret < 0)
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return ret;
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avio_read(s->pb, signature, sizeof(signature));
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ret = ffio_read_size(s->pb, signature, sizeof(signature));
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if (ret < 0)
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return ret;
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if (!memcmp(signature, "DAHUA", 5)) {
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avio_skip(s->pb, 0x400 - 5);
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dhav->last_good_pos = avio_tell(s->pb);
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