From: Jimmy Hu <hhhuuu@google.com>
To: linux@roeck-us.net, heikki.krogerus@linux.intel.com,
gregkh@linuxfoundation.org
Cc: kyletso@google.com, badhri@google.com, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, Jimmy Hu <hhhuuu@google.com>,
stable@vger.kernel.org
Subject: [PATCH v2] usb: typec: tcpm: Fix NULL pointer dereference in tcpm_pd_svdm()
Date: Fri, 20 Oct 2023 01:21:32 +0000 [thread overview]
Message-ID: <20231020012132.100960-1-hhhuuu@google.com> (raw)
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@vger.kernel.org
Signed-off-by: Jimmy Hu <hhhuuu@google.com>
---
drivers/usb/typec/tcpm/tcpm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 6e843c511b85..792ec4ac7d8d 100644
--- 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 *port, struct typec_altmode *adev,
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]));
--
2.42.0.758.gaed0368e0e-goog
next reply other threads:[~2023-10-20 1:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-20 1:21 Jimmy Hu [this message]
2023-10-30 7:33 ` [PATCH v2] usb: typec: tcpm: Fix NULL pointer dereference in tcpm_pd_svdm() Heikki Krogerus
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