linux-kernel - [PATCH 4.4 01/59] media: imon: Fix null-ptr-deref in imon

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Message-Id: <20171119143151.028483914@linuxfoundation.org>
Date:   Sun, 19 Nov 2017 15:32:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arvind Yadav <arvind.yadav.cs@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 4.4 01/59] media: imon: Fix null-ptr-deref in imon_probe

4.4-stable 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>
Cc: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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) {