CVE-2023-53472

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> pwm: lpc32xx: Remove handling of PWM channels<br /> <br /> Because LPC32xx PWM controllers have only a single output which is<br /> registered as the only PWM device/channel per controller, it is known in<br /> advance that pwm-&gt;hwpwm value is always 0. On basis of this fact<br /> simplify the code by removing operations with pwm-&gt;hwpwm, there is no<br /> controls which require channel number as input.<br /> <br /> Even though I wasn&amp;#39;t aware at the time when I forward ported that patch,<br /> this fixes a null pointer dereference as lpc32xx-&gt;chip.pwms is NULL<br /> before devm_pwmchip_add() is called.