In the Linux kernel, the following vulnerability has been resolved:
pinctrl: bcm2835: Don't remove an unregistered GPIO chip
If the devm_pinctrl_register() function fails,
bcm2835_pinctrl_probe() calls gpiochip_remove()
before gpiochip_add_data() has registered the GPIO chip. This means that upon failure the gpio_chip.gpiodev
is NULL resulting in a null pointer dereference
inside the gpiochip_remove() function. Remove the unnecessary function call to gpiochip_remove().
No GPIO cleanup is required because the GPIO chip
has not yet been registered. Without this change there
is potential for a kernel panic upon registration failure
References 8
https://git.kernel.org/stable/c/32711f77db0641e57fd96fdc013bf1286b9f2514
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/3b978fd0a3092b25561ac26bc1a87149fa981ddc
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/68ea6dd23b732081826c36033835468383487864
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/727f043d699ab0d5d87122c2177f2b45fbe58d35
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b8535f5c77cc61352d02a0c038a280127a8b8208
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d428863ca8baa4e9eaf781266ac219b017dcf277
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/dd6b1919e41d1260259c4505777be565fb3a7efd
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f494cfc254cd509d7cbc44b843e0a6602a520a33
416baaa9-dc9f-4396-8d5f-8c081fb06d67