USB: cdc-acm: fix potential null-pointer dereference

Must check return value of tty_port_tty_get. Cc: stable <stable@kernel.org> Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
mariux64 · Mar 23, 2011 · 15e5bee · 15e5bee
1 parent 23b8055
commit 15e5bee
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
@@ -533,6 +533,8 @@ static void acm_softint(struct work_struct *work)
 	if (!ACM_READY(acm))
 		return;
 	tty = tty_port_tty_get(&acm->port);
+	if (!tty)
+		return;
 	tty_wakeup(tty);
 	tty_kref_put(tty);
 }