From: Bartosz Golaszewski Date: Tue, 18 Nov 2025 20:04:59 +0000 (+0100) Subject: gpio: shared: fix a NULL-pointer dereference X-Git-Tag: v6.19-rc1~146^2~32 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01be9047988d15850ca15d146c5f4aeb5de2f569;p=thirdparty%2Flinux.git 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 Closes: https://lore.kernel.org/all/dbe20642-9662-40af-a593-c1263baea73b@sirena.org.uk/ Tested-by: Mark Brown Link: https://lore.kernel.org/r/20251118200459.13969-1-brgl@bgdev.pl Signed-off-by: Bartosz Golaszewski --- diff --git a/drivers/gpio/gpiolib-shared.c b/drivers/gpio/gpiolib-shared.c index c22eaf05eef23..4ce574a21850b 100644 --- a/drivers/gpio/gpiolib-shared.c +++ b/drivers/gpio/gpiolib-shared.c @@ -205,7 +205,10 @@ static int gpio_shared_of_traverse(struct device_node *curr) static int gpio_shared_of_scan(void) { - return gpio_shared_of_traverse(of_root); + if (of_root) + return gpio_shared_of_traverse(of_root); + + return 0; } #else static int gpio_shared_of_scan(void)