[PATCH 2/9] mISDN: Check address length before reading address family

[Tetsuo Handa]

KMSAN will complain if valid address length passed to bind() is shorter
than sizeof("struct sockaddr_mISDN"->family) bytes.

Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
---
 drivers/isdn/mISDN/socket.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index 4ab8b1b6608f..a14e35d40538 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -710,10 +710,10 @@ base_sock_bind(struct socket *sock, struct sockaddr 
*addr, int addr_len)
        struct sock *sk = sock->sk;
        int err = 0;
 
-       if (!maddr || maddr->family != AF_ISDN)
+       if (addr_len < sizeof(struct sockaddr_mISDN))
                return -EINVAL;
 
-       if (addr_len < sizeof(struct sockaddr_mISDN))
+       if (!maddr || maddr->family != AF_ISDN)
                return -EINVAL;
 
        lock_sock(sk);
-- 
2.16.5