linux-kernel - [PATCH 4.10 083/110] PCI: xgene: Fix double free on init error

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Date:   Mon, 10 Apr 2017 18:43:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Tanmay Inamdar <tinamdar@....com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.10 083/110] PCI: xgene: Fix double free on init error

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 1ded56df3247d358390ae6dc09ccee620262ac5f ]

The "port" variable was allocated with devm_kzalloc() so if we free it with
kfree() it will be freed twice.  Also I changed it to propogate the error
from devm_ioremap_resource() instead of returning -ENOMEM.

Fixes: c5d460396100 ("PCI: Add MCFG quirks for X-Gene host controller")
Also-posted-by: Shawn Lin <shawn.lin@...k-chips.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Tanmay Inamdar <tinamdar@....com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/host/pci-xgene.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/drivers/pci/host/pci-xgene.c
+++ b/drivers/pci/host/pci-xgene.c
@@ -246,14 +246,11 @@ static int xgene_pcie_ecam_init(struct p
 	ret = xgene_get_csr_resource(adev, &csr);
 	if (ret) {
 		dev_err(dev, "can't get CSR resource\n");
-		kfree(port);
 		return ret;
 	}
 	port->csr_base = devm_ioremap_resource(dev, &csr);
-	if (IS_ERR(port->csr_base)) {
-		kfree(port);
-		return -ENOMEM;
-	}
+	if (IS_ERR(port->csr_base))
+		return PTR_ERR(port->csr_base);
 
 	port->cfg_base = cfg->win;
 	port->version = ipversion;