linux-kernel - [PATCH] PCI: endpoint: Fix potential double free in __pci_epc

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Message-Id: <20221220045930.1106921-1-linmq006@gmail.com>
Date:   Tue, 20 Dec 2022 08:59:29 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] PCI: endpoint: Fix potential double free in __pci_epc_create

When all references are dropped, callback function pci_epc_release()
for put_device() already call kfree(epc) to release memory.
Remove abundant kfree to fix double free.

Fixes: 7711cbb4862a ("PCI: endpoint: Fix WARN() when an endpoint driver is removed")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 2542196e8c3d..7dc640c99d9a 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -800,8 +800,6 @@ __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 
 put_dev:
 	put_device(&epc->dev);
-	kfree(epc);
-
 err_ret:
 	return ERR_PTR(ret);
 }
-- 
2.25.1