gpio: cdev: check for NULL labels when sanitizing them for irqs

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We need to take into account that a line's consumer label may be NULL
and not try to kstrdup() it in that case but rather pass the NULL
pointer up the stack to the interrupt request function.

To that end: let make_irq_label() return NULL as a valid return value
and use ERR_PTR() instead to signal an allocation failure to callers.

Cc: stable@vger.kernel.org
Fixes: b34490879b ("gpio: cdev: sanitize the label before requesting the interrupt")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/lkml/20240402093534.212283-1-naresh.kamboju@linaro.org/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Tested-by: Anders Roxell <anders.roxell@linaro.org>

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This commit is contained in:

Bartosz Golaszewski 2024-04-04 11:33:27 +02:00

parent e8acd2d209

commit b3b9596459

1 changed files with 14 additions and 5 deletions

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drivers/gpio/gpiolib-cdev.c

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