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authorColin Ian King <colin.king@canonical.com>2017-11-14 19:18:28 +0300
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-11-28 14:04:50 +0300
commitb2fc059fa549fe6881d4c1f8d698b0f50bcd16ec (patch)
tree179ab5772ba2175236fce42963f1e99fd8f3a1ae /drivers/usb/gadget/composite.c
parent593e789fd4421635bde09398b8a8fb510b18414a (diff)
downloadlinux-b2fc059fa549fe6881d4c1f8d698b0f50bcd16ec.tar.xz
usb: gadget: don't dereference g until after it has been null checked
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: b785ea7ce662 ("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>
Diffstat (limited to 'drivers/usb/gadget/composite.c')
-rw-r--r--drivers/usb/gadget/composite.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index eec14e6ed20b..77c7ecca816a 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -146,7 +146,6 @@ 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;
@@ -226,8 +225,12 @@ 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;
}