[PATCH 3.14 37/64] tty/n_gsm.c: fix a memory leak when gsmtty is removed

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pan Xinhui <xinhuix.pan@intel.com>

commit 8f9cfeed3eae86c70d3b04445a6f2036b27b6304 upstream.

when gsmtty_remove put dlci, it will cause memory leak if dlci->port's refcount is zero.
So we do the cleanup work in .cleanup callback instead.

dlci will be last put in two call chains.
1) gsmld_close -> gsm_cleanup_mux -> gsm_dlci_release -> dlci_put
2) gsmld_remove -> dlci_put
so there is a race. the memory leak depends on the race.

In call chain 2. we hit the memory leak. below comment tells.

release_tty -> tty_driver_remove_tty -> gsmtty_remove -> dlci_put -> tty_port_destructor (WARN_ON(port->itty) and return directly)
                         |
                tty->port->itty = NULL;
                         |
                tty_kref_put ---> release_one_tty -> gsmtty_cleanup (added by our patch)

So our patch fix the memory leak by doing the cleanup work after tty core did.

Signed-off-by: Pan Xinhui <xinhuix.pan@intel.com>
Fixes: dfabf7ffa30585
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/tty/n_gsm.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3166,7 +3166,7 @@ static int gsmtty_break_ctl(struct tty_s
 	return gsmtty_modem_update(dlci, encode);
 }
 
-static void gsmtty_remove(struct tty_driver *driver, struct tty_struct *tty)
+static void gsmtty_cleanup(struct tty_struct *tty)
 {
 	struct gsm_dlci *dlci = tty->driver_data;
 	struct gsm_mux *gsm = dlci->gsm;
@@ -3174,7 +3174,6 @@ static void gsmtty_remove(struct tty_dri
 	dlci_put(dlci);
 	dlci_put(gsm->dlci[0]);
 	mux_put(gsm);
-	driver->ttys[tty->index] = NULL;
 }
 
 /* Virtual ttys for the demux */
@@ -3195,7 +3194,7 @@ static const struct tty_operations gsmtt
 	.tiocmget		= gsmtty_tiocmget,
 	.tiocmset		= gsmtty_tiocmset,
 	.break_ctl		= gsmtty_break_ctl,
-	.remove			= gsmtty_remove,
+	.cleanup		= gsmtty_cleanup,
 };