netdev - [PATCH] net: mvpp2: fix possible invalid pointer dereference

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Date:   Tue, 15 Nov 2022 12:46:32 +0800
From:   Hui Tang <tanghui20@...wei.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <mw@...ihalf.com>, <linux@...linux.org.uk>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yusongping@...wei.com>
Subject: [PATCH] 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>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index d98f7e9a480e..c92bd1922421 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -7421,7 +7421,7 @@ static int mvpp2_probe(struct platform_device *pdev)
 			dev_warn(&pdev->dev, "Fail to alloc CM3 SRAM\n");
 
 		/* Enable global Flow Control only if handler to SRAM not NULL */
-		if (priv->cm3_base)
+		if (!IS_ERR_OR_NULL(priv->cm3_base))
 			priv->global_tx_fc = true;
 	}
 
-- 
2.17.1