Patch "usb: typec: tcpm: Fix NULL pointer dereference in tcpm_pd_svdm()" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    usb: typec: tcpm: Fix NULL pointer dereference in tcpm_pd_svdm()

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-typec-tcpm-fix-null-pointer-dereference-in-tcpm_pd_svdm.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 4987daf86c152ff882d51572d154ad12e4ff3a4b Mon Sep 17 00:00:00 2001
From: Jimmy Hu <hhhuuu@xxxxxxxxxx>
Date: Fri, 20 Oct 2023 01:21:32 +0000
Subject: usb: typec: tcpm: Fix NULL pointer dereference in tcpm_pd_svdm()

From: Jimmy Hu <hhhuuu@xxxxxxxxxx>

commit 4987daf86c152ff882d51572d154ad12e4ff3a4b upstream.

It is possible that typec_register_partner() returns ERR_PTR on failure.
When port->partner is an error, a NULL pointer dereference may occur as
shown below.

[91222.095236][  T319] typec port0: failed to register partner (-17)
...
[91225.061491][  T319] Unable to handle kernel NULL pointer dereference
at virtual address 000000000000039f
[91225.274642][  T319] pc : tcpm_pd_data_request+0x310/0x13fc
[91225.274646][  T319] lr : tcpm_pd_data_request+0x298/0x13fc
[91225.308067][  T319] Call trace:
[91225.308070][  T319]  tcpm_pd_data_request+0x310/0x13fc
[91225.308073][  T319]  tcpm_pd_rx_handler+0x100/0x9e8
[91225.355900][  T319]  kthread_worker_fn+0x178/0x58c
[91225.355902][  T319]  kthread+0x150/0x200
[91225.355905][  T319]  ret_from_fork+0x10/0x30

Add a check for port->partner to avoid dereferencing a NULL pointer.

Fixes: 5e1d4c49fbc8 ("usb: typec: tcpm: Determine common SVDM Version")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jimmy Hu <hhhuuu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231020012132.100960-1-hhhuuu@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/typec/tcpm/tcpm.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -1625,6 +1625,9 @@ static int tcpm_pd_svdm(struct tcpm_port
 			if (PD_VDO_VID(p[0]) != USB_SID_PD)
 				break;
 
+			if (IS_ERR_OR_NULL(port->partner))
+				break;
+
 			if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
 				typec_partner_set_svdm_version(port->partner,
 							       PD_VDO_SVDM_VER(p[0]));


Patches currently in stable-queue which might be from hhhuuu@xxxxxxxxxx are

queue-6.6/usb-typec-tcpm-fix-null-pointer-dereference-in-tcpm_pd_svdm.patch



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