From 6af6be278e3ba2ffb6af5b796c89dfb3f5d9063e Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Sun, 15 Feb 2026 12:05:55 -0800 Subject: [PATCH] gpio: cdev: Avoid NULL dereference in linehandle_create() In linehandle_create(), there is a statement like this: retain_and_null_ptr(lh); Soon after, there is a debug printout that dereferences "lh", which will crash things. Avoid the crash by using handlereq.lines, which is the same value. Fixes: da7e394bf58f ("gpio: convert linehandle_create() to FD_PREPARE()") Signed-off-by: Douglas Anderson Link: https://patch.msgid.link/20260215120555.v2.1.I77c3eb563271c21870379eefd16ebbc4e09635bb@changeid Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib-cdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 2adc3c070908..189127721e38 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -388,7 +388,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip) fd_publish(fdf); dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", - lh->num_descs); + handlereq.lines); return 0; } -- 2.30.2