CVE-2023-52877

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> usb: typec: tcpm: Fix NULL pointer dereference in tcpm_pd_svdm()<br /> <br /> It is possible that typec_register_partner() returns ERR_PTR on failure.<br /> When port-&gt;partner is an error, a NULL pointer dereference may occur as<br /> shown below.<br /> <br /> [91222.095236][ T319] typec port0: failed to register partner (-17)<br /> ...<br /> [91225.061491][ T319] Unable to handle kernel NULL pointer dereference<br /> at virtual address 000000000000039f<br /> [91225.274642][ T319] pc : tcpm_pd_data_request+0x310/0x13fc<br /> [91225.274646][ T319] lr : tcpm_pd_data_request+0x298/0x13fc<br /> [91225.308067][ T319] Call trace:<br /> [91225.308070][ T319] tcpm_pd_data_request+0x310/0x13fc<br /> [91225.308073][ T319] tcpm_pd_rx_handler+0x100/0x9e8<br /> [91225.355900][ T319] kthread_worker_fn+0x178/0x58c<br /> [91225.355902][ T319] kthread+0x150/0x200<br /> [91225.355905][ T319] ret_from_fork+0x10/0x30<br /> <br /> Add a check for port-&gt;partner to avoid dereferencing a NULL pointer.