linux-kernel - Re: [PATCH] gpio: virtuser: fix UAF in configfs release path

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Message-ID: <202601251126.ywFiWrat-lkp@intel.com>
Date: Sun, 25 Jan 2026 11:35:30 +0800
From: kernel test robot <lkp@...el.com>
To: Yuhao Huang <nekowong743@...il.com>, linux-gpio@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, linus.walleij@...aro.org, brgl@...ev.pl,
	linux-kernel@...r.kernel.org, Yuhao Huang <nekowong743@...il.com>
Subject: Re: [PATCH] gpio: virtuser: fix UAF in configfs release path

Hi Yuhao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on brgl/gpio/for-next]
[also build test WARNING on linus/master v6.19-rc6 next-20260123]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yuhao-Huang/gpio-virtuser-fix-UAF-in-configfs-release-path/20260125-002359
base:   https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next
patch link:    https://lore.kernel.org/r/20260124162111.3945666-1-nekowong743%40gmail.com
patch subject: [PATCH] gpio: virtuser: fix UAF in configfs release path
config: m68k-randconfig-r073-20260125 (https://download.01.org/0day-ci/archive/20260125/202601251126.ywFiWrat-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.5.0
smatch version: v0.5.0-8994-gd50c5a4c

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601251126.ywFiWrat-lkp@intel.com/

smatch warnings:
drivers/gpio/gpio-virtuser.c:1685 gpio_virtuser_device_config_group_release() warn: inconsistent indenting

vim +1685 drivers/gpio/gpio-virtuser.c

  1680	
  1681	static void gpio_virtuser_device_config_group_release(struct config_item *item)
  1682	{
  1683		struct gpio_virtuser_device *dev = to_gpio_virtuser_device(item);
  1684	
> 1685	    scoped_guard(mutex, &dev->lock) {
  1686	        if (gpio_virtuser_device_is_live(dev))
  1687	            gpio_virtuser_device_deactivate(dev);
  1688	    }
  1689	
  1690		mutex_destroy(&dev->lock);
  1691		ida_free(&gpio_virtuser_ida, dev->id);
  1692		kfree(dev);
  1693	}
  1694	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki