[PATCH 3.18 01/38] media: imon: Fix null-ptr-deref in imon_probe

Greg Kroah-Hartman
2017-11-19T14:29:54Z

From: Arvind Yadav <arvind.yadav.cs@gmail.com>

commit 58fd55e838276a0c13d1dc7c387f90f25063cbf3 upstream.

It seems that the return value of usb_ifnum_to_if() can be NULL and
needs to be checked.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/media/rc/imon.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -2419,6 +2419,11 @@ static int imon_probe(struct usb_interfa
mutex_lock(&driver_lock);

first_if = usb_ifnum_to_if(usbdev, 0);
+ if (!first_if) {
+ ret = -ENODEV;
+ goto fail;
+ }
+
first_if_ctx = usb_get_intfdata(first_if);

if (ifnum == 0) {