pwm: lpc32xx: Remove handling of PWM channels (CVE-2023-53472)

Summary

pwm: lpc32xx: Remove handling of PWM channels

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

pwm: lpc32xx: Remove handling of PWM channels

Because LPC32xx PWM controllers have only a single output which is
registered as the only PWM device/channel per controller, it is known in
advance that pwm->hwpwm value is always 0. On basis of this fact
simplify the code by removing operations with pwm->hwpwm, there is no
controls which require channel number as input.

Even though I wasn't aware at the time when I forward ported that patch,
this fixes a null pointer dereference as lpc32xx->chip.pwms is NULL
before devm_pwmchip_add() is called.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.326"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.295"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.257"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.195"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.132"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.1.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.5.4"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2023-53472 linux Fixed in: 5.10.197-1
Ubuntu UBUNTU-CVE-2023-53472 linux-azure

Summary

Original description

Affected packages

Fix status by distribution

References