[PATCH] media: usbvision: fix a potential NULL pointer dereference

[Kangjie Lu]

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

Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
---
 drivers/media/usb/usbvision/usbvision-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/usbvision/usbvision-core.c b/drivers/media/usb/usbvision/usbvision-core.c
index 31e0e98d6daf..1b0d0a0f0e87 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);
-- 
2.17.1