From: Jesper Juhl Date: Mon, 30 Jul 2007 13:15:26 +0000 (+0200) Subject: USB HID: fix a possible NULL pointer dereference when we fail to allocate memory X-Git-Tag: v2.6.23-rc2~17 X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=de1a7b03282310d143cb0add74e909daffedda01;p=linux-2.6-omap-h63xx.git USB HID: fix a possible NULL pointer dereference when we fail to allocate memory If, in usb_hid_configure(), we fail to allocate storage for 'usbhid', "if (!(usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL)))", then we'll jump to the 'fail:' label where we have this code: usb_free_urb(usbhid->urbin); usb_free_urb(usbhid->urbout); usb_free_urb(usbhid->urbctrl); Since we got here because we couldn't allocate storage for 'usbhid', what we have here is a NULL pointer dereference - ouch... This patch solves that little problem by adding a new 'fail_no_usbhid:' label after the problematic calls to usb_free_urb() and jumps to that one instead, in the problem case. Signed-off-by: Jesper Juhl Signed-off-by: Jiri Kosina --- diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index b2baeaeba9b..3ff74685875 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -743,7 +743,7 @@ static struct hid_device *usb_hid_configure(struct usb_interface *intf) hid->quirks = quirks; if (!(usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL))) - goto fail; + goto fail_no_usbhid; hid->driver_data = usbhid; usbhid->hid = hid; @@ -877,6 +877,7 @@ fail: usb_free_urb(usbhid->urbin); usb_free_urb(usbhid->urbout); usb_free_urb(usbhid->urbctrl); +fail_no_usbhid: hid_free_buffers(dev, hid); hid_free_device(hid);