CVE-2023-54220

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> serial: 8250: Fix oops for port-&gt;pm on uart_change_pm()<br /> <br /> Unloading a hardware specific 8250 driver can produce error "Unable to<br /> handle kernel paging request at virtual address" about ten seconds after<br /> unloading the driver. This happens on uart_hangup() calling<br /> uart_change_pm().<br /> <br /> Turns out commit 04e82793f068 ("serial: 8250: Reinit port-&gt;pm on port<br /> specific driver unbind") was only a partial fix. If the hardware specific<br /> driver has initialized port-&gt;pm function, we need to clear port-&gt;pm too.<br /> Just reinitializing port-&gt;ops does not do this. Otherwise serial8250_pm()<br /> will call port-&gt;pm() instead of serial8250_do_pm().