From: Jimmy Hu hhhuuu@google.com

mainline inclusion from mainline-v6.2-rc5 commit e8fb5bc76eb86437ab87002d4a36d6da02165654 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IALIMI CVE: CVE-2023-52901

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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When the host controller is not responding, all URBs queued to all endpoints need to be killed. This can cause a kernel panic if we dereference an invalid endpoint.

Fix this by using xhci_get_virt_ep() helper to find the endpoint and checking if the endpoint is valid before dereferencing it.

[233311.853271] xhci-hcd xhci-hcd.1.auto: xHCI host controller not responding, assume dead [233311.853393] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000e8

[233311.853964] pc : xhci_hc_died+0x10c/0x270 [233311.853971] lr : xhci_hc_died+0x1ac/0x270

[233311.854077] Call trace: [233311.854085] xhci_hc_died+0x10c/0x270 [233311.854093] xhci_stop_endpoint_command_watchdog+0x100/0x1a4 [233311.854105] call_timer_fn+0x50/0x2d4 [233311.854112] expire_timers+0xac/0x2e4 [233311.854118] run_timer_softirq+0x300/0xabc [233311.854127] __do_softirq+0x148/0x528 [233311.854135] irq_exit+0x194/0x1a8 [233311.854143] __handle_domain_irq+0x164/0x1d0 [233311.854149] gic_handle_irq.22273+0x10c/0x188 [233311.854156] el1_irq+0xfc/0x1a8 [233311.854175] lpm_cpuidle_enter+0x25c/0x418 [msm_pm] [233311.854185] cpuidle_enter_state+0x1f0/0x764 [233311.854194] do_idle+0x594/0x6ac [233311.854201] cpu_startup_entry+0x7c/0x80 [233311.854209] secondary_start_kernel+0x170/0x198

Fixes: 50e8725e7c42 ("xhci: Refactor command watchdog and fix split string.") Cc: stable@vger.kernel.org Signed-off-by: Jimmy Hu hhhuuu@google.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Message-ID: 0fe978ed-8269-9774-1c40-f8a98c17e838@linux.intel.com Link: https://lore.kernel.org/r/20230116142216.1141605-3-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Liao Chen liaochen4@huawei.com --- drivers/usb/host/xhci-ring.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index fa3a7ac15f82..9ed6ce9cd9b2 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -949,7 +949,10 @@ static void xhci_kill_endpoint_urbs(struct xhci_hcd *xhci, struct xhci_virt_ep *ep; struct xhci_ring *ring;

- ep = &xhci->devs[slot_id]->eps[ep_index]; + ep = xhci_get_virt_ep(xhci, slot_id, ep_index); + if (!ep) + return; + if ((ep->ep_state & EP_HAS_STREAMS) || (ep->ep_state & EP_GETTING_NO_STREAMS)) { int stream_id;