tree d03763df93c8b163fe86e97baaf62d2f6f3d5158
parent 15bf722e6f6c0b884521a0363204532e849deb7f
author Colin Ian King <colin.king@canonical.com> 1433268313 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1433798704 -0700

usb: isp1760: check for null return from kzalloc

isp1760_ep_alloc_request allocates a structure with kzalloc without checking
for NULL and then returns a pointer to one of the structure fields. As the
field happens to be the first in the structure the caller can properly check
for NULL, but this is risky if the structure layout is changed later. Add an
explicit NULL check for the kzalloc return value

Detected with smatch static analysis:

drivers/usb/isp1760/isp1760-udc.c:816 isp1760_ep_alloc_request()
  error: potential null dereference 'req'.  (kzalloc returns null)

[ thanks to Laurent Pinchart for improved commit message ]

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>