linux-kernel - Re: [PATCH] iwlwifi: fix a potential NULL pointer dereference

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Date:   Thu, 19 Sep 2019 04:19:39 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Allen Pais <allen.pais@...cle.com>
Cc:     kbuild-all@...org, kvalo@...eaurora.org, davem@...emloft.net,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iwlwifi: fix a potential NULL pointer dereference

Hi Allen,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[cannot apply to v5.3 next-20190917]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Allen-Pais/iwlwifi-fix-a-potential-NULL-pointer-dereference/20190919-021453
config: mips-allmodconfig (attached as .config)
compiler: mips-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>):

   drivers/net/wireless/intel/iwlwifi/pcie/trans.c: In function 'iwl_trans_pcie_alloc':
>> drivers/net/wireless/intel/iwlwifi/pcie/trans.c:3659:10: warning: return makes pointer from integer without a cast [-Wint-conversion]
      return -ENOMEM;
             ^

vim +3659 drivers/net/wireless/intel/iwlwifi/pcie/trans.c

  3625	
  3626		iwl_pcie_set_interrupt_capa(pdev, trans);
  3627		trans->hw_id = (pdev->device << 16) + pdev->subsystem_device;
  3628		snprintf(trans->hw_id_str, sizeof(trans->hw_id_str),
  3629			 "PCI ID: 0x%04X:0x%04X", pdev->device, pdev->subsystem_device);
  3630	
  3631		/* Initialize the wait queue for commands */
  3632		init_waitqueue_head(&trans_pcie->wait_command_queue);
  3633	
  3634		init_waitqueue_head(&trans_pcie->d0i3_waitq);
  3635	
  3636		if (trans_pcie->msix_enabled) {
  3637			ret = iwl_pcie_init_msix_handler(pdev, trans_pcie);
  3638			if (ret)
  3639				goto out_no_pci;
  3640		 } else {
  3641			ret = iwl_pcie_alloc_ict(trans);
  3642			if (ret)
  3643				goto out_no_pci;
  3644	
  3645			ret = devm_request_threaded_irq(&pdev->dev, pdev->irq,
  3646							iwl_pcie_isr,
  3647							iwl_pcie_irq_handler,
  3648							IRQF_SHARED, DRV_NAME, trans);
  3649			if (ret) {
  3650				IWL_ERR(trans, "Error allocating IRQ %d\n", pdev->irq);
  3651				goto out_free_ict;
  3652			}
  3653			trans_pcie->inta_mask = CSR_INI_SET_MASK;
  3654		 }
  3655	
  3656		trans_pcie->rba.alloc_wq = alloc_workqueue("rb_allocator",
  3657							   WQ_HIGHPRI | WQ_UNBOUND, 1);
  3658		if (unlikely(!trans_pcie->rba.alloc_wq)) {
> 3659			return -ENOMEM;
  3660			goto out_free_ict;
  3661		}
  3662	
  3663		INIT_WORK(&trans_pcie->rba.rx_alloc, iwl_pcie_rx_allocator_work);
  3664	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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