Re: [PATCH] crypto: qat - fix Use-After-Free in adf_ctl_ioctl_dev_start()

[kernel test robot <lkp@intel.com>]

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on herbert-cryptodev-2.6/master]
[also build test ERROR on herbert-crypto-2.6/master linus/master v7.1-rc3 next-20260508]
[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/w15303746062-163-com/crypto-qat-fix-Use-After-Free-in-adf_ctl_ioctl_dev_start/20260510-110441
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
patch link:    https://lore.kernel.org/r/20260508023542.256299-1-w15303746062%40163.com
patch subject: [PATCH] crypto: qat - fix Use-After-Free in adf_ctl_ioctl_dev_start()
config: loongarch-randconfig-001-20260510 (https://download.01.org/0day-ci/archive/20260511/202605112040.jcfTlYZH-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260511/202605112040.jcfTlYZH-lkp@intel.com/reproduce)

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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605112040.jcfTlYZH-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c:286:6: error: use of undeclared identifier 'accel_dev'
     286 |         if (accel_dev)
         |             ^~~~~~~~~
   drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c:287:15: error: use of undeclared identifier 'accel_dev'
     287 |                 adf_dev_put(accel_dev);
         |                             ^~~~~~~~~
   2 errors generated.


vim +/accel_dev +286 drivers/crypto/intel/qat/qat_common/adf_ctl_drv.c

   255	
   256	static int adf_ctl_ioctl_dev_stop(struct file *fp, unsigned int cmd,
   257					  unsigned long arg)
   258	{
   259		int ret;
   260		struct adf_user_cfg_ctl_data *ctl_data;
   261	
   262		ctl_data = adf_ctl_alloc_resources(arg);
   263		if (IS_ERR(ctl_data))
   264			return PTR_ERR(ctl_data);
   265	
   266		if (adf_devmgr_verify_id(ctl_data->device_id)) {
   267			pr_err("QAT: Device %d not found\n", ctl_data->device_id);
   268			ret = -ENODEV;
   269			goto out;
   270		}
   271	
   272		ret = adf_ctl_is_device_in_use(ctl_data->device_id);
   273		if (ret)
   274			goto out;
   275	
   276		if (ctl_data->device_id == ADF_CFG_ALL_DEVICES)
   277			pr_info("QAT: Stopping all acceleration devices.\n");
   278		else
   279			pr_info("QAT: Stopping acceleration device qat_dev%d.\n",
   280				ctl_data->device_id);
   281	
   282		adf_ctl_stop_devices(ctl_data->device_id);
   283	
   284	out:
   285		/* Release the reference acquired by adf_devmgr_get_dev_by_id() */
 > 286		if (accel_dev)
   287			adf_dev_put(accel_dev);
   288	
   289		kfree(ctl_data);
   290		return ret;
   291	}
   292	

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