SUNRPC: lock against ->sock changing during sysfs read

[linux-2.6-microblaze.git] / net / sunrpc / sysfs.c

diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index b64a028..05c758d 100644 (file)
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c
@@ -115,11 +115,14 @@ static ssize_t rpc_sysfs_xprt_srcaddr_show(struct kobject *kobj,
        }
 
        sock = container_of(xprt, struct sock_xprt, xprt);
-       if (kernel_getsockname(sock->sock, (struct sockaddr *)&saddr) < 0)
+       mutex_lock(&sock->recv_mutex);
+       if (sock->sock == NULL ||
+           kernel_getsockname(sock->sock, (struct sockaddr *)&saddr) < 0)
                goto out;
 
        ret = sprintf(buf, "%pISc\n", &saddr);
 out:
+       mutex_unlock(&sock->recv_mutex);
        xprt_put(xprt);
        return ret + 1;
 }