linux-kernel - [PATCH RESEND #2 3/3] tty: handle NULL parameters in free_tty

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Date:	Wed, 08 Aug 2012 16:29:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH RESEND #2 3/3] tty: handle NULL parameters in free_tty_struct()

From: Dan Carpenter <dan.carpenter@...cle.com>

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@...cle.com>
---

 drivers/tty/tty_io.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 6087499..6784aae 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)
 		put_device(tty->dev);
 	kfree(tty->write_buf);

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