af_unix: move unix_mknod() out of bindlock

[ Upstream commit 0fb44559ffd67de8517098b81f675fa0210f13f0 ]

Dmitry reported a deadlock scenario:

unix_bind() path:
u->bindlock ==> sb_writer

do_splice() path:
sb_writer ==> pipe->mutex ==> u->bindlock

In the unix_bind() code path, unix_mknod() does not have to
be done with u->bindlock held, since it is a pure fs operation,
so we can just move unix_mknod() out.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 3974413f78e7cda5951b4439246a993fb252796a..339532b152231a60d90be50223d1ee139e0772ba 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -978,6 +978,7 @@ 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)
@@ -993,9 +994,20 @@ 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->readlock);
        if (err)
-               goto out;
+               goto out_put;
 
        err = -EINVAL;
        if (u->addr)
@@ -1012,16 +1024,6 @@ 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 = path.dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1);
                spin_lock(&unix_table_lock);
@@ -1048,6 +1050,9 @@ out_unlock:
        spin_unlock(&unix_table_lock);
 out_up:
        mutex_unlock(&u->readlock);
+out_put:
+       if (err)
+               path_put(&path);
 out:
        return err;
 }