CVE-2023-53472
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 4.9.284 | 4.10 |
| linux / linux_kernel | 4.14.248 | 4.14.326 |
| linux / linux_kernel | 4.19.208 | 4.19.295 |
| linux / linux_kernel | 5.4.149 | 5.4.257 |
| linux / linux_kernel | 5.10.69 | 5.10.195 |
| linux / linux_kernel | 5.14.8 | 5.15.132 |
| linux / linux_kernel | 5.16 | 6.1.54 |
| linux / linux_kernel | 6.2 | 6.5.4 |
- https://git.kernel.org/stable/c/04301da4d87067a989f70ee56942bf9d97cd2a45
- https://git.kernel.org/stable/c/4aae44f65827f0213a7361cf9c32cfe06114473f
- https://git.kernel.org/stable/c/523f6268e86552a048975749251184c4e9a4b38f
- https://git.kernel.org/stable/c/5e22217c11424ef958ba28d03ff7167b4d7a8914
- https://git.kernel.org/stable/c/a2d9d884e84bfd37892219b1f55847f36d8e9901
- https://git.kernel.org/stable/c/a9a505f5b39d8fff1a55963a5e524c84639e98b2
- https://git.kernel.org/stable/c/abd9b2ee4047ccd980decbf26d61f9637604b1d5
- https://git.kernel.org/stable/c/e3a0ddbaf7f1f9ffc070718b417461ced3268758
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