linux-kernel - [17/44] USB: serial/kobil_sct, fix potential tty NULL dereference

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Date:	Mon, 21 Mar 2011 16:09:57 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jiri Slaby <jslaby@...e.cz>, Alan Cox <alan@...ux.intel.com>
Subject: [17/44] USB: serial/kobil_sct, fix potential tty NULL dereference

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

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

From: Jiri Slaby <jslaby@...e.cz>

commit 6960f40a954619857e7095a6179eef896f297077 upstream.

Make sure that we check the return value of tty_port_tty_get.
Sometimes it may return NULL and we later dereference that.

The only place here is in kobil_read_int_callback, so fix it.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/serial/kobil_sct.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -372,7 +372,7 @@ static void kobil_read_int_callback(stru
 	}
 
 	tty = tty_port_tty_get(&port->port);
-	if (urb->actual_length) {
+	if (tty && urb->actual_length) {
 
 		/* BEGIN DEBUG */
 		/*


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