tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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gpio: shared: fix a NULL-pointer dereference

The fact that CONFIG_OF is enabled does not mean that the device tree is
populated and that of_root points to a valid device node. Check if it's
NULL before trying to traverse the tree.

Fixes: a060b8c511ab ("gpiolib: implement low-level, shared GPIO support")
Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/all/dbe20642-9662-40af-a593-c1263baea73b@sirena.org.uk/
Tested-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20251118200459.13969-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Bartosz Golaszewski 01be9047 bb7c963d

+4 -1
+4 -1
drivers/gpio/gpiolib-shared.c
··· 205 205 206 206 static int gpio_shared_of_scan(void) 207 207 { 208 - return gpio_shared_of_traverse(of_root); 208 + if (of_root) 209 + return gpio_shared_of_traverse(of_root); 210 + 211 + return 0; 209 212 } 210 213 #else 211 214 static int gpio_shared_of_scan(void)