CVE-2024-38633

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> serial: max3100: Update uart_driver_registered on driver removal<br /> <br /> The removal of the last MAX3100 device triggers the removal of<br /> the driver. However, code doesn&amp;#39;t update the respective global<br /> variable and after insmod — rmmod — insmod cycle the kernel<br /> oopses:<br /> <br /> max3100 spi-PRP0001:01: max3100_probe: adding port 0<br /> BUG: kernel NULL pointer dereference, address: 0000000000000408<br /> ...<br /> RIP: 0010:serial_core_register_port+0xa0/0x840<br /> ...<br /> max3100_probe+0x1b6/0x280 [max3100]<br /> spi_probe+0x8d/0xb0<br /> <br /> Update the actual state so next time UART driver will be registered<br /> again.<br /> <br /> Hugo also noticed, that the error path in the probe also affected<br /> by having the variable set, and not cleared. Instead of clearing it<br /> move the assignment after the successfull uart_register_driver() call.