[PATCH 4.13 01/28] media: imon: Fix null-ptr-deref in imon_probe

From: Greg Kroah-Hartman
Date: Sun Nov 19 2017 - 09:51:04 EST


4.13-stable review patch. If anyone has any objections, please let me know.

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

From: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>

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@xxxxxxxxx>
Tested-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Sean Young <sean@xxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Cc: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -2516,6 +2516,11 @@ 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) {