[patch] tty: handle NULL parameters in free_tty_struct()

From: Dan Carpenter
Date: Fri Jul 20 2012 - 03:06:39 EST

We sometimes pass NULL pointers to free_tty_struct(). One example where
it can happen is in the error handling code in pty_common_install().

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index ca7c25d..e49b839 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -181,6 +181,8 @@ struct tty_struct *alloc_tty_struct(void)

void free_tty_struct(struct tty_struct *tty)
+ if (!tty)
+ return;
if (tty->dev)
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