linux-kernel - [PATCH] media: gspaca: check pointer against NULL before using it in create

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Message-Id: <1389088562-463-1-git-send-email-ethan.kernel@gmail.com>
Date:	Tue,  7 Jan 2014 17:56:02 +0800
From:	Ethan Zhao <ethan.kernel@...il.com>
To:	hans.verkuil@...co.com, m.chehab@...sung.com,
	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, Ethan Zhao <ethan.kernel@...il.com>
Subject: [PATCH] media: gspaca: check pointer against NULL before using it in create_urbs()

function alt_xfer() may return NULL, should check its return value passed into
create_urbs() as parameter.

gspca_init_transfer()
{
... ...
ret = create_urbs(gspca_dev,alt_xfer(&intf->altsetting[alt], xfer));
... ...
}

Signed-off-by: Ethan Zhao <ethan.kernel@...il.com>
---
 drivers/media/usb/gspca/gspca.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/usb/gspca/gspca.c b/drivers/media/usb/gspca/gspca.c
index 048507b..eb45bc0 100644
--- a/drivers/media/usb/gspca/gspca.c
+++ b/drivers/media/usb/gspca/gspca.c
@@ -761,6 +761,8 @@ static int create_urbs(struct gspca_dev *gspca_dev,
 	struct urb *urb;
 	int n, nurbs, i, psize, npkt, bsize;
 
+	if (!ep)
+		return -EINVAL;
 	/* calculate the packet size and the number of packets */
 	psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 
-- 
1.8.3.4 (Apple Git-47)

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