CVE-2024-26748

In the Linux kernel, the following vulnerability has been resolved:

usb: cdns3: fix memory double free when handle zero packet

829 if (request->complete) {

830 spin_unlock(&priv_dev->lock);

831 usb_gadget_giveback_request(&priv_ep->endpoint,

832 request);

833 spin_lock(&priv_dev->lock);

834 }

835

836 if (request->buf == priv_dev->zlp_buf)

837 cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);

Driver append an additional zero packet request when queue a packet, which

length mod max packet size is 0. When transfer complete, run to line 831,

usb_gadget_giveback_request() will free this requestion. 836 condition is

true, so cdns3_gadget_ep_free_request() free this request again.

Log:

[ 1920.140696][ T150] BUG: KFENCE: use-after-free read in cdns3_gadget_giveback+0x134/0x2c0 [cdns3]

[ 1920.140696][ T150]

[ 1920.151837][ T150] Use-after-free read at 0x000000003d1cd10b (in kfence-#36):

[ 1920.159082][ T150] cdns3_gadget_giveback+0x134/0x2c0 [cdns3]

[ 1920.164988][ T150] cdns3_transfer_completed+0x438/0x5f8 [cdns3]

Add check at line 829, skip call usb_gadget_giveback_request() if it is

additional zero length packet request. Needn't call

usb_gadget_giveback_request() because it is allocated in this driver.