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Message-ID: <20221117084032.101144-1-tanghui20@huawei.com>
Date: Thu, 17 Nov 2022 16:40:32 +0800
From: Hui Tang <tanghui20@...wei.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<mw@...ihalf.com>, <linux@...linux.org.uk>, <leon@...nel.org>,
<andrew@...n.ch>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<yusongping@...wei.com>
Subject: [PATCH net v5] net: mvpp2: fix possible invalid pointer dereference
It will cause invalid pointer dereference to priv->cm3_base behind,
if PTR_ERR(priv->cm3_base) in mvpp2_get_sram().
Fixes: a59d354208a7 ("net: mvpp2: enable global flow control")
Signed-off-by: Hui Tang <tanghui20@...wei.com>
---
v1 -> v2: patch title include target
v2 -> v3: keep priv->cm3_base NULL if devm_ioremap_resource() failed
v3 -> v4: change if (priv->cm3_base) to if (base)
v4 -> v5: use the idiomatic error handling, keep success path un-indented
---
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index d98f7e9a480e..4f3c1757620c 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -7349,6 +7349,7 @@ static int mvpp2_get_sram(struct platform_device *pdev,
struct mvpp2 *priv)
{
struct resource *res;
+ void __iomem *base;
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (!res) {
@@ -7359,9 +7360,12 @@ static int mvpp2_get_sram(struct platform_device *pdev,
return 0;
}
- priv->cm3_base = devm_ioremap_resource(&pdev->dev, res);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
- return PTR_ERR_OR_ZERO(priv->cm3_base);
+ priv->cm3_base = base;
+ return 0;
}
static int mvpp2_probe(struct platform_device *pdev)
--
2.17.1
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