| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 21/77] net: unix: allow bind to fail on mutex lock | Date | Mon, 13 Jan 2014 16:27:42 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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From: Sasha Levin <sasha.levin@oracle.com>
[ Upstream commit 37ab4fa7844a044dc21fde45e2a0fc2f3c3b6490 ]
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/unix/af_unix.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -718,7 +718,9 @@ static int unix_autobind(struct socket * 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 goto out; addr_len = err; - mutex_lock(&u->readlock); + err = mutex_lock_interruptible(&u->readlock); + if (err) + goto out; err = -EINVAL; if (u->addr)
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