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-rw-r--r--drivers/usb/class/cdc-acm.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index ea5e487448b..e61d9c43e98 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -554,10 +554,18 @@ static void acm_port_down(struct acm *acm)
static void acm_tty_hangup(struct tty_struct *tty)
{
- struct acm *acm = tty->driver_data;
- tty_port_hangup(&acm->port);
+ struct acm *acm;
+
mutex_lock(&open_mutex);
+ acm = tty->driver_data;
+
+ if (!acm)
+ goto out;
+
+ tty_port_hangup(&acm->port);
acm_port_down(acm);
+
+out:
mutex_unlock(&open_mutex);
}