[PATCH 5/9] rxrpc: Check address length before reading srx_service field

[Tetsuo Handa]

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

Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
---
 net/rxrpc/af_rxrpc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 96f2952bbdfd..c54dce3ca0dd 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -135,7 +135,7 @@ static int rxrpc_bind(struct socket *sock, struct sockaddr 
*saddr, int len)
        struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
        struct rxrpc_local *local;
        struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
-       u16 service_id = srx->srx_service;
+       u16 service_id;
        int ret;
 
        _enter("%p,%p,%d", rx, saddr, len);
@@ -143,6 +143,7 @@ static int rxrpc_bind(struct socket *sock, struct sockaddr 
*saddr, int len)
        ret = rxrpc_validate_address(rx, srx, len);
        if (ret < 0)
                goto error;
+       service_id = srx->srx_service;
 
        lock_sock(&rx->sk);
 
-- 
2.16.5