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usb: gadget: don't dereference g until after it has been null checked 

[ Upstream commit b2fc059fa5 ]

Avoid dereferencing pointer g until after g has been sanity null checked;
move the assignment of cdev much later when it is required into a more
local scope.

Detected by CoverityScan, CID#1222135 ("Dereference before null check")

Fixes: b785ea7ce6 ("usb: gadget: composite: fix ep->maxburst initialization")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Colin Ian King 2017-11-14 16:18:28 +00:00 committed by Greg Kroah-Hartman
parent aafb1a7eb0
commit 0479bc0176
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/gadget/composite.c
View File

@ -150,7 +150,6 @@ int config_ep_by_speed(struct usb_gadget *g,
struct usb_function *f,
struct usb_ep *_ep)
{
struct usb_composite_dev *cdev = get_gadget_data(g);
struct usb_endpoint_descriptor *chosen_desc = NULL;
struct usb_descriptor_header **speed_desc = NULL;
@ -229,8 +228,12 @@ ep_found:
_ep->maxburst = comp_desc->bMaxBurst + 1;
break;
default:
if (comp_desc->bMaxBurst != 0)
if (comp_desc->bMaxBurst != 0) {
struct usb_composite_dev *cdev;
cdev = get_gadget_data(g);
ERROR(cdev, "ep0 bMaxBurst must be 0\n");
}
_ep->maxburst = 1;
break;
}