net: unix: allow bind to fail on mutex lock

This is similar to the set_peek_off patch where calling bind while the
socket is stuck in unix_dgram_recvmsg() will block and cause a hung task
spew after a while.

This is also the last place that did a straightforward mutex_lock(), so
there shouldn't be any more of these patches.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index a0ca162e5bd5..a427623ee574 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -718,7 +718,9 @@ static int unix_autobind(struct socket *sock)
         int err;
         unsigned int retries = 0;
 
-        mutex_lock(&u->readlock);
+        err = mutex_lock_interruptible(&u->readlock);
+        if (err)
+                return err;
 
         err = 0;
         if (u->addr)
@@ -877,7 +879,9 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                 goto out;
         addr_len = err;
 
-        mutex_lock(&u->readlock);
+        err = mutex_lock_interruptible(&u->readlock);
+        if (err)
+                goto out;
 
         err = -EINVAL;
         if (u->addr)