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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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