linux-kernel - [PATCH] PCI: rcar-ep: Fix the issue of the name parameter when calling devm_request_mem

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Message-ID: <tencent_59625EFD404130F5900D6FB48840AD428F05@qq.com>
Date: Sat,  4 Jan 2025 11:39:41 +0800
From: kingdix10@...com
To: marek.vasut+renesas@...il.com,
	yoshihiro.shimoda.uh@...esas.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	bhelgaas@...gle.com
Cc: linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	King Dix <kingdix10@...com>
Subject: [PATCH] PCI: rcar-ep: Fix the issue of the name parameter when calling devm_request_mem_region

From: King Dix <kingdix10@...com>

When using devm_request_mem_region to request a resource, if the passed
variable is a stack string variable, it will lead to an oops issue when
eecuting the command cat /proc/iomem.

Fix this by replacing outbound_name with the name of the previously
requested resource.

Signed-off-by: King Dix <kingdix10@...com>
---
 drivers/pci/controller/pcie-rcar-ep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-rcar-ep.c b/drivers/pci/controller/pcie-rcar-ep.c
index 047e2cef5afc..464f8f29390c 100644
--- a/drivers/pci/controller/pcie-rcar-ep.c
+++ b/drivers/pci/controller/pcie-rcar-ep.c
@@ -107,7 +107,7 @@ static int rcar_pcie_parse_outbound_ranges(struct rcar_pcie_endpoint *ep,
 		}
 		if (!devm_request_mem_region(&pdev->dev, res->start,
 					     resource_size(res),
-					     outbound_name)) {
+						 res->name)) {
 			dev_err(pcie->dev, "Cannot request memory region %s.\n",
 				outbound_name);
 			return -EIO;
-- 
2.43.0