[PATCH] media: gspaca: check pointer against NULL before using it in create_urbs()

[Ethan Zhao]

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@xxxxxxxxx>
---
 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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