Messages in this thread | | | Subject | Re: [PATCH -next] scsi: hisi_sas: drop free_irq of devm_request_irq allocated irq | From | Yang Yingliang <> | Date | Wed, 19 May 2021 11:36:22 +0800 |
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On 2021/5/18 23:34, John Garry wrote: > On 18/05/2021 14:09, Yang Yingliang wrote: >> irq allocated with devm_request_irq should not be freed using >> free_irq, because doing so causes a dangling pointer, and a >> subsequent double free. >> >> Reported-by: Hulk Robot <hulkci@huawei.com> >> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> >> --- >> drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 6 +++--- >> 1 file changed, 3 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c >> b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c >> index 499c770d405c..684f762bcfb3 100644 >> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c >> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c >> @@ -4811,9 +4811,9 @@ hisi_sas_v3_destroy_irqs(struct pci_dev *pdev, >> struct hisi_hba *hisi_hba) >> { >> int i; >> - free_irq(pci_irq_vector(pdev, 1), hisi_hba); >> - free_irq(pci_irq_vector(pdev, 2), hisi_hba); >> - free_irq(pci_irq_vector(pdev, 11), hisi_hba); >> + devm_free_irq(&pdev->dev, pci_irq_vector(pdev, 1), hisi_hba); >> + devm_free_irq(&pdev->dev, pci_irq_vector(pdev, 2), hisi_hba); >> + devm_free_irq(&pdev->dev, pci_irq_vector(pdev, 11), hisi_hba); >> for (i = 0; i < hisi_hba->cq_nvecs; i++) { >> struct hisi_sas_cq *cq = &hisi_hba->cq[i]; >> int nr = hisi_sas_intr_conv ? 16 : 16 + i; >> > > Does the free_irq(pci_irq_vector(pdev, nr, cq)) call also need to > change (not shown)? Yes, I missed that, it should be changed too. > > Having said that, why have these at all if we use devm_request_irq()? > devm_irq_release() calls free_irq(). I keep the original logic here, only avoid double free. > > Thanks, > John > > .
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