linux-kernel - [PATCH 5.12 312/677] memory: renesas-rpc-if: fix possible NULL pointer dereference of resource

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Message-Id: <20210512144847.583657194@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:45:58 +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,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 312/677] memory: renesas-rpc-if: fix possible NULL pointer dereference of resource

From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

[ Upstream commit 59e27d7c94aa02da039b000d33c304c179395801 ]

The platform_get_resource_byname() can return NULL which would be
immediately dereferenced by resource_size().  Instead dereference it
after validating the resource.

Addresses-Coverity: Dereference null return value
Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Link: https://lore.kernel.org/r/20210407154357.70200-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/memory/renesas-rpc-if.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 8d36e221def1..45eed659b0c6 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -192,10 +192,10 @@ int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
 	}
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
-	rpc->size = resource_size(res);
 	rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(rpc->dirmap))
 		rpc->dirmap = NULL;
+	rpc->size = resource_size(res);
 
 	rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 
-- 
2.30.2