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Message-ID: <202212170217.ClAOBcqp-lkp@intel.com>
Date:   Sat, 17 Dec 2022 02:13:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Logan Gunthorpe <logang@...tatee.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>
Subject: Re: [PATCH v2 2/2] PCI: switchtec: Return -EFAULT for copy_to_user()
 errors

Hi Bjorn,

I love your patch! Perhaps something to improve:

[auto build test WARNING on helgaas-pci/next]
[also build test WARNING on helgaas-pci/for-linus linus/master v6.1 next-20221216]
[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/Bjorn-Helgaas/PCI-switchtec-Trivial-cleanups/20221217-002341
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
patch link:    https://lore.kernel.org/r/20221216162126.207863-3-helgaas%40kernel.org
patch subject: [PATCH v2 2/2] PCI: switchtec: Return -EFAULT for copy_to_user() errors
config: x86_64-allyesconfig
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/a598bd934af2ccce340a59da1d10a3959b085dd0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Bjorn-Helgaas/PCI-switchtec-Trivial-cleanups/20221217-002341
        git checkout a598bd934af2ccce340a59da1d10a3959b085dd0
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/pci/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/pci/switch/switchtec.c: In function 'switchtec_dev_read':
>> drivers/pci/switch/switchtec.c:623:1: warning: label 'out' defined but not used [-Wunused-label]
     623 | out:
         | ^~~


vim +/out +623 drivers/pci/switch/switchtec.c

080b47def5e5e2 Logan Gunthorpe           2017-03-06  557  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  558  static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
080b47def5e5e2 Logan Gunthorpe           2017-03-06  559  				  size_t size, loff_t *off)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  560  {
080b47def5e5e2 Logan Gunthorpe           2017-03-06  561  	struct switchtec_user *stuser = filp->private_data;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  562  	struct switchtec_dev *stdev = stuser->stdev;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  563  	int rc;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  564  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  565  	if (size < sizeof(stuser->cmd) ||
080b47def5e5e2 Logan Gunthorpe           2017-03-06  566  	    size > sizeof(stuser->cmd) + sizeof(stuser->data))
080b47def5e5e2 Logan Gunthorpe           2017-03-06  567  		return -EINVAL;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  568  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  569  	rc = lock_mutex_and_test_alive(stdev);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  570  	if (rc)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  571  		return rc;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  572  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  573  	if (stuser->state == MRPC_IDLE) {
080b47def5e5e2 Logan Gunthorpe           2017-03-06  574  		mutex_unlock(&stdev->mrpc_mutex);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  575  		return -EBADE;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  576  	}
080b47def5e5e2 Logan Gunthorpe           2017-03-06  577  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  578  	stuser->read_len = size - sizeof(stuser->return_code);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  579  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  580  	mutex_unlock(&stdev->mrpc_mutex);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  581  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  582  	if (filp->f_flags & O_NONBLOCK) {
deaa0a8a74d865 Sebastian Andrzej Siewior 2020-03-21  583  		if (!stuser->cmd_done)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  584  			return -EAGAIN;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  585  	} else {
deaa0a8a74d865 Sebastian Andrzej Siewior 2020-03-21  586  		rc = wait_event_interruptible(stuser->cmd_comp,
deaa0a8a74d865 Sebastian Andrzej Siewior 2020-03-21  587  					      stuser->cmd_done);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  588  		if (rc < 0)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  589  			return rc;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  590  	}
080b47def5e5e2 Logan Gunthorpe           2017-03-06  591  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  592  	rc = lock_mutex_and_test_alive(stdev);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  593  	if (rc)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  594  		return rc;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  595  
1a323bd071dd81 Kelvin Cao                2021-10-14  596  	if (stuser->state == MRPC_IO_ERROR) {
1a323bd071dd81 Kelvin Cao                2021-10-14  597  		mutex_unlock(&stdev->mrpc_mutex);
1a323bd071dd81 Kelvin Cao                2021-10-14  598  		return -EIO;
1a323bd071dd81 Kelvin Cao                2021-10-14  599  	}
1a323bd071dd81 Kelvin Cao                2021-10-14  600  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  601  	if (stuser->state != MRPC_DONE) {
080b47def5e5e2 Logan Gunthorpe           2017-03-06  602  		mutex_unlock(&stdev->mrpc_mutex);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  603  		return -EBADE;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  604  	}
080b47def5e5e2 Logan Gunthorpe           2017-03-06  605  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  606  	rc = copy_to_user(data, &stuser->return_code,
080b47def5e5e2 Logan Gunthorpe           2017-03-06  607  			  sizeof(stuser->return_code));
080b47def5e5e2 Logan Gunthorpe           2017-03-06  608  	if (rc) {
a598bd934af2cc Bjorn Helgaas             2022-12-16  609  		mutex_unlock(&stdev->mrpc_mutex);
a598bd934af2cc Bjorn Helgaas             2022-12-16  610  		return -EFAULT;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  611  	}
080b47def5e5e2 Logan Gunthorpe           2017-03-06  612  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  613  	data += sizeof(stuser->return_code);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  614  	rc = copy_to_user(data, &stuser->data,
080b47def5e5e2 Logan Gunthorpe           2017-03-06  615  			  size - sizeof(stuser->return_code));
080b47def5e5e2 Logan Gunthorpe           2017-03-06  616  	if (rc) {
a598bd934af2cc Bjorn Helgaas             2022-12-16  617  		mutex_unlock(&stdev->mrpc_mutex);
a598bd934af2cc Bjorn Helgaas             2022-12-16  618  		return -EFAULT;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  619  	}
080b47def5e5e2 Logan Gunthorpe           2017-03-06  620  
080b47def5e5e2 Logan Gunthorpe           2017-03-06  621  	stuser_set_state(stuser, MRPC_IDLE);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  622  
080b47def5e5e2 Logan Gunthorpe           2017-03-06 @623  out:
080b47def5e5e2 Logan Gunthorpe           2017-03-06  624  	mutex_unlock(&stdev->mrpc_mutex);
080b47def5e5e2 Logan Gunthorpe           2017-03-06  625  
551ec658b69807 Kelvin Cao                2021-10-14  626  	if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE ||
551ec658b69807 Kelvin Cao                2021-10-14  627  	    stuser->status == SWITCHTEC_MRPC_STATUS_ERROR)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  628  		return size;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  629  	else if (stuser->status == SWITCHTEC_MRPC_STATUS_INTERRUPTED)
080b47def5e5e2 Logan Gunthorpe           2017-03-06  630  		return -ENXIO;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  631  	else
080b47def5e5e2 Logan Gunthorpe           2017-03-06  632  		return -EBADMSG;
080b47def5e5e2 Logan Gunthorpe           2017-03-06  633  }
080b47def5e5e2 Logan Gunthorpe           2017-03-06  634  

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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