packet: validate address length if non-zero
Willem de Bruijn authored
[ Upstream commit 6b8d95f1 ]

Validate packet socket address length if a length is given. Zero
length is equivalent to not setting an address.

Fixes: 99137b78

 ("packet: validate address length")
Reported-by: default avatarIdo Schimmel <idosch@idosch.org>
Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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