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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Zhang Shengju <zhangshengju@cmss.chinamobile.com>,
        Tang Bin <tangbin@cmss.chinamobile.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.6 074/167] net: ethernet: ixp4xx: Add error handling in ixp4xx_eth_probe()
Date:   Tue, 28 Apr 2020 20:24:10 +0200
Message-Id: <20200428182234.302058926@linuxfoundation.org>
In-Reply-To: <20200428182225.451225420@linuxfoundation.org>
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From: Tang Bin <tangbin@cmss.chinamobile.com>

[ Upstream commit 6ed79cec3ced6e346a10a70120fcee5f03591bab ]

The function ixp4xx_eth_probe() does not perform sufficient error
checking after executing devm_ioremap_resource(), which can result
in crashes if a critical error path is encountered.

Fixes: f458ac479777 ("ARM/net: ixp4xx: Pass ethernet physical base as resource")
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/xscale/ixp4xx_eth.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/ethernet/xscale/ixp4xx_eth.c
+++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c
@@ -1387,6 +1387,8 @@ static int ixp4xx_eth_probe(struct platf
 		return -ENODEV;
 	regs_phys = res->start;
 	port->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(port->regs))
+		return PTR_ERR(port->regs);
 
 	switch (port->id) {
 	case IXP4XX_ETH_NPEA: