af_unix: move unix_mknod() out of bindlock

[firefly-linux-kernel-4.4.55.git] / net / unix / af_unix.c

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 73f75258ce4694be1235078ff062c3f0e73a1e3b..b2e934ff2448dec64fa3dc533a16b0733df6d1c2 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -994,6 +994,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
        unsigned int hash;
        struct unix_address *addr;
        struct hlist_head *list;
+       struct path path = { NULL, NULL };
 
        err = -EINVAL;
        if (sunaddr->sun_family != AF_UNIX)
@@ -1009,9 +1010,20 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                goto out;
        addr_len = err;
 
+       if (sun_path[0]) {
+               umode_t mode = S_IFSOCK |
+                      (SOCK_INODE(sock)->i_mode & ~current_umask());
+               err = unix_mknod(sun_path, mode, &path);
+               if (err) {
+                       if (err == -EEXIST)
+                               err = -EADDRINUSE;
+                       goto out;
+               }
+       }
+
        err = mutex_lock_interruptible(&u->bindlock);
        if (err)
-               goto out;
+               goto out_put;
 
        err = -EINVAL;
        if (u->addr)
@@ -1028,16 +1040,6 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
        atomic_set(&addr->refcnt, 1);
 
        if (sun_path[0]) {
-               struct path path;
-               umode_t mode = S_IFSOCK |
-                      (SOCK_INODE(sock)->i_mode & ~current_umask());
-               err = unix_mknod(sun_path, mode, &path);
-               if (err) {
-                       if (err == -EEXIST)
-                               err = -EADDRINUSE;
-                       unix_release_addr(addr);
-                       goto out_up;
-               }
                addr->hash = UNIX_HASH_SIZE;
                hash = d_real_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1);
                spin_lock(&unix_table_lock);
@@ -1064,6 +1066,9 @@ out_unlock:
        spin_unlock(&unix_table_lock);
 out_up:
        mutex_unlock(&u->bindlock);
+out_put:
+       if (err)
+               path_put(&path);
 out:
        return err;
 }