From: Kiruthika Varadarajan Kiruthika.Varadarajan@harman.com
On spin lock release in rx_submit, gether_disconnect get a chance to run, it makes port_usb NULL, rx_submit access NULL port USB, hence null pointer crash.
Fixed by releasing the lock in rx_submit after port_usb is used.
Fixes: 2b3d942c4878 ("usb ethernet gadget: split out network core") Cc: stable@vger.kernel.org Signed-off-by: Kiruthika Varadarajan Kiruthika.Varadarajan@harman.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com --- drivers/usb/gadget/function/u_ether.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c index 737bd77a575d..2929bb47a618 100644 --- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -186,11 +186,12 @@ rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags) out = dev->port_usb->out_ep; else out = NULL; - spin_unlock_irqrestore(&dev->lock, flags);
if (!out) + { + spin_unlock_irqrestore(&dev->lock, flags); return -ENOTCONN; - + }
/* Padding up to RX_EXTRA handles minor disagreements with host. * Normally we use the USB "terminate on short read" convention; @@ -214,6 +215,7 @@ rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
if (dev->port_usb->is_fixed) size = max_t(size_t, size, dev->port_usb->fixed_out_len); + spin_unlock_irqrestore(&dev->lock, flags);
skb = __netdev_alloc_skb(dev->net, size + NET_IP_ALIGN, gfp_flags); if (skb == NULL) {