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net/stun: Fix STUN attribute padding (#710)

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net/stun: fix STUN attribute padding

Signed-off-by: RenThraysk <renthraysk@gmail.com>
This commit is contained in:
renthraysk
2020-08-24 20:52:13 +01:00
committed by GitHub
parent 9be1917c5b
commit 10cad39abd
2 changed files with 38 additions and 3 deletions
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6
net/stun/stun.go
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@@ -137,15 +137,15 @@ func foreachAttr(b []byte, fn func(attrType uint16, a []byte) error) error {
}
attrType := binary.BigEndian.Uint16(b[:2])
attrLen := int(binary.BigEndian.Uint16(b[2:4]))
attrLenPad := attrLen % 4
attrLenWithPad := (attrLen + 3) &^ 3
b = b[4:]
if attrLen+attrLenPad > len(b) {
if attrLenWithPad > len(b) {
return ErrMalformedAttrs
}
if err := fn(attrType, b[:attrLen]); err != nil {
return err
}
b = b[attrLen+attrLenPad:]
b = b[attrLenWithPad:]
}
return nil
}