[PATCH 5.4 21/84] scsi: hisi_sas: Drop free_irq() of devm_request_irq() allocated irq

Greg Kroah-Hartman
2021-06-14T11:00:32Z

From: Yang Yingliang <yangyingliang@huawei.com>

[ Upstream commit 7907a021e4bbfa29cccacd2ba2dade894d9a7d4c ]

irqs allocated with devm_request_irq() should not be freed using
free_irq(). Doing so causes a dangling pointer and a subsequent double
free.

Link: https://lore.kernel.org/r/20210519130519.2661938-1-yangyingliang@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 723f51c822af..916447f3c607 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -3274,14 +3274,14 @@ 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;

- free_irq(pci_irq_vector(pdev, nr), cq);
+ devm_free_irq(&pdev->dev, pci_irq_vector(pdev, nr), cq);
}
pci_free_irq_vectors(pdev);
}
--
2.30.2