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llc: Check address length before reading address field

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KMSAN will complain if valid address length passed to bind() is shorter
than sizeof(struct sockaddr_llc) bytes.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tetsuo Handa 2019-04-12 19:55:14 +09:00 committed by David S. Miller
parent bd7d46ddca
commit c68e747d0a
1 changed files with 1 additions and 2 deletions
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3
net/llc/af_llc.c
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@ -320,14 +320,13 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
struct llc_sap *sap;
int rc = -EINVAL;
dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
lock_sock(sk);
if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
goto out;
rc = -EAFNOSUPPORT;
if (unlikely(addr->sllc_family != AF_LLC))
goto out;
dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
rc = -ENODEV;
rcu_read_lock();
if (sk->sk_bound_dev_if) {