linux-kernel - [PATCH 3.16 123/133] media: imon: Fix null-ptr-deref in imon

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Message-ID: <lsq.1511315893.723584252@decadent.org.uk>
Date:   Wed, 22 Nov 2017 01:58:13 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Mauro Carvalho Chehab" <mchehab@....samsung.com>,
        "Arvind Yadav" <arvind.yadav.cs@...il.com>,
        "Andrey Konovalov" <andreyknvl@...gle.com>,
        "Sean Young" <sean@...s.org>
Subject: [PATCH 3.16 123/133] media: imon: Fix null-ptr-deref in imon_probe

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Arvind Yadav <arvind.yadav.cs@...il.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@...il.com>
Tested-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/rc/imon.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -2312,6 +2312,11 @@ 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) {