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Tue, 18 Nov 2025 12:05:07 -0800 (PST) From: Bartosz Golaszewski To: Mark Brown Cc: Linus Walleij , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH] gpio: shared: fix a NULL-pointer dereference Date: Tue, 18 Nov 2025 21:04:59 +0100 Message-ID: <20251118200459.13969-1-brgl@bgdev.pl> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Bartosz Golaszewski 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@si= rena.org.uk/ Signed-off-by: Bartosz Golaszewski Tested-by: Mark Brown --- drivers/gpio/gpiolib-shared.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) 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) =20 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) --=20 2.51.0