linux-kernel - [PATCH 1/3] PCI: Fix double-free in resource attribute error path

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Date:   Tue, 16 Aug 2022 13:40:04 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     linux-pci@...r.kernel.org, bhelgaas@...gle.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] PCI: Fix double-free in resource attribute error path

If pci_create_attr() fails the remaining resource bin attributes are
removed and freed based on the pointer entries which are not cleared
in the case that creation of the bin attribute fails.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 drivers/pci/pci-sysfs.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index fc804e08e3cb..9ac92e6a2397 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1196,8 +1196,14 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 	res_attr->size = pci_resource_len(pdev, num);
 	res_attr->private = (void *)(unsigned long)num;
 	retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
-	if (retval)
+	if (retval) {
+		if (write_combine)
+			pdev->res_attr_wc[num] = NULL;
+		else
+			pdev->res_attr[num] = NULL;
+
 		kfree(res_attr);
+	}
 
 	return retval;
 }