Subject: CVE-2023-52901: usb: xhci: Check endpoint is valid before dereferencing it

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

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

usb: xhci: Check endpoint is valid before dereferencing it

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

The Linux kernel CVE team has assigned CVE-2023-52901 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 4.14.304 with commit 375be2dd61a0
	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 4.19.271 with commit 2d2820d5f375
	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 5.4.230 with commit 9891e5c73cab
	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 5.10.165 with commit 66fc1600855c
	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 5.15.90 with commit f39c813af0b6
	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 6.1.8 with commit 08864dc14a68
	Issue introduced in 3.15 with commit 50e8725e7c42 and fixed in 6.2 with commit e8fb5bc76eb8

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2023-52901
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/usb/host/xhci-ring.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/375be2dd61a072f7b1cac9b17eea59e07b58db3a
	https://git.kernel.org/stable/c/2d2820d5f375563690c96e60676855205abfb7f5
	https://git.kernel.org/stable/c/9891e5c73cab3fd9ed532dc50e9799e55e974766
	https://git.kernel.org/stable/c/66fc1600855c05c4ba4e997184c91cf298e0405c
	https://git.kernel.org/stable/c/f39c813af0b64f44af94e435c07bfa1ddc2575f5
	https://git.kernel.org/stable/c/08864dc14a6803f0377ca77b9740b26db30c020f
	https://git.kernel.org/stable/c/e8fb5bc76eb86437ab87002d4a36d6da02165654