From: Colin Ian King colin.king@canonical.com
[ Upstream commit eafa80041645cd7604c4357b1a0cd4a3c81f2227 ]
Currently pointer ep is being dereferenced before it is null checked leading to a null pointer dereference issue. Fix this by only assigning pointer udc once ep is known to be not null. Also remove a debug message that requires a valid udc which may not be possible at that point.
Addresses-Coverity: ("Dereference before null check") Fixes: 24a28e428351 ("USB: gadget driver for LPC32xx") Signed-off-by: Colin Ian King colin.king@canonical.com Signed-off-by: Felipe Balbi balbi@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/usb/gadget/udc/lpc32xx_udc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c index 21921db068f6..cf56819f16e4 100644 --- a/drivers/usb/gadget/udc/lpc32xx_udc.c +++ b/drivers/usb/gadget/udc/lpc32xx_udc.c @@ -1602,17 +1602,17 @@ static int lpc32xx_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) { struct lpc32xx_ep *ep = container_of(_ep, struct lpc32xx_ep, ep); - struct lpc32xx_udc *udc = ep->udc; + struct lpc32xx_udc *udc; u16 maxpacket; u32 tmp; unsigned long flags;
/* Verify EP data */ if ((!_ep) || (!ep) || (!desc) || - (desc->bDescriptorType != USB_DT_ENDPOINT)) { - dev_dbg(udc->dev, "bad ep or descriptor\n"); + (desc->bDescriptorType != USB_DT_ENDPOINT)) return -EINVAL; - } + + udc = ep->udc; maxpacket = usb_endpoint_maxp(desc); if ((maxpacket == 0) || (maxpacket > ep->maxpacket)) { dev_dbg(udc->dev, "bad ep descriptor's packet size\n"); @@ -1860,7 +1860,7 @@ static int lpc32xx_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) static int lpc32xx_ep_set_halt(struct usb_ep *_ep, int value) { struct lpc32xx_ep *ep = container_of(_ep, struct lpc32xx_ep, ep); - struct lpc32xx_udc *udc = ep->udc; + struct lpc32xx_udc *udc; unsigned long flags;
if ((!ep) || (ep->hwep_num <= 1)) @@ -1870,6 +1870,7 @@ static int lpc32xx_ep_set_halt(struct usb_ep *_ep, int value) if (ep->is_in) return -EAGAIN;
+ udc = ep->udc; spin_lock_irqsave(&udc->lock, flags);
if (value == 1) {