From: Kangjie Lu <kjlu@umn.edu>
Date: Sat, 9 Mar 2019 07:42:26 +0000 (-0500)
Subject: media: usbvision: fix a potential NULL pointer dereference
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f8ee34c3e77afd8cfc13f98e326325f17494f1e5;p=openwrt%2Fstaging%2Fblogic.git

media: usbvision: fix a potential NULL pointer dereference

In case usb_alloc_coherent fails, the fix returns -ENOMEM to
avoid a potential NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---

diff --git a/drivers/media/usb/usbvision/usbvision-core.c b/drivers/media/usb/usbvision/usbvision-core.c
index 92d166bf8c12..abc4eed832a3 100644
--- a/drivers/media/usb/usbvision/usbvision-core.c
+++ b/drivers/media/usb/usbvision/usbvision-core.c
@@ -2302,6 +2302,9 @@ int usbvision_init_isoc(struct usb_usbvision *usbvision)
 					   sb_size,
 					   GFP_KERNEL,
 					   &urb->transfer_dma);
+		if (!usbvision->sbuf[buf_idx].data)
+			return -ENOMEM;
+
 		urb->dev = dev;
 		urb->context = usbvision;
 		urb->pipe = usb_rcvisocpipe(dev, usbvision->video_endp);