Subject: CVE-2024-26600: phy: ti: phy-omap-usb2: Fix NULL pointer dereference for SRP

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

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

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

phy: ti: phy-omap-usb2: Fix NULL pointer dereference for SRP

If the external phy working together with phy-omap-usb2 does not implement
send_srp(), we may still attempt to call it. This can happen on an idle
Ethernet gadget triggering a wakeup for example:

configfs-gadget.g1 gadget.0: ECM Suspend
configfs-gadget.g1 gadget.0: Port suspended. Triggering wakeup
...
Unable to handle kernel NULL pointer dereference at virtual address
00000000 when execute
...
PC is at 0x0
LR is at musb_gadget_wakeup+0x1d4/0x254 [musb_hdrc]
...
musb_gadget_wakeup [musb_hdrc] from usb_gadget_wakeup+0x1c/0x3c [udc_core]
usb_gadget_wakeup [udc_core] from eth_start_xmit+0x3b0/0x3d4 [u_ether]
eth_start_xmit [u_ether] from dev_hard_start_xmit+0x94/0x24c
dev_hard_start_xmit from sch_direct_xmit+0x104/0x2e4
sch_direct_xmit from __dev_queue_xmit+0x334/0xd88
__dev_queue_xmit from arp_solicit+0xf0/0x268
arp_solicit from neigh_probe+0x54/0x7c
neigh_probe from __neigh_event_send+0x22c/0x47c
__neigh_event_send from neigh_resolve_output+0x14c/0x1c0
neigh_resolve_output from ip_finish_output2+0x1c8/0x628
ip_finish_output2 from ip_send_skb+0x40/0xd8
ip_send_skb from udp_send_skb+0x124/0x340
udp_send_skb from udp_sendmsg+0x780/0x984
udp_sendmsg from __sys_sendto+0xd8/0x158
__sys_sendto from ret_fast_syscall+0x0/0x58

Let's fix the issue by checking for send_srp() and set_vbus() before
calling them. For USB peripheral only cases these both could be NULL.

The Linux kernel CVE team has assigned CVE-2024-26600 to this issue.

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

	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 4.19.307 with commit 486218c11e8d
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 5.4.269 with commit 8398d8d735ee
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 5.10.210 with commit be3b82e4871b
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 5.15.149 with commit 8cc889b9dea0
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 6.1.78 with commit 0430bfcd4665
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 6.6.17 with commit 14ef61594a5a
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 6.7.5 with commit 396e17af6761
	Issue introduced in 3.7 with commit 657b306a7bdf and fixed in 6.8 with commit 7104ba0f1958

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-2024-26600
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/phy/ti/phy-omap-usb2.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/486218c11e8d1c8f515a3bdd70d62203609d4b6b
	https://git.kernel.org/stable/c/8398d8d735ee93a04fb9e9f490e8cacd737e3bf5
	https://git.kernel.org/stable/c/be3b82e4871ba00e9b5d0ede92d396d579d7b3b3
	https://git.kernel.org/stable/c/8cc889b9dea0579726be9520fcc766077890b462
	https://git.kernel.org/stable/c/0430bfcd46657d9116a26cd377f112cbc40826a4
	https://git.kernel.org/stable/c/14ef61594a5a286ae0d493b8acbf9eac46fd04c4
	https://git.kernel.org/stable/c/396e17af6761b3cc9e6e4ca94b4de7f642bfece1
	https://git.kernel.org/stable/c/7104ba0f1958adb250319e68a15eff89ec4fd36d