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memory: renesas-rpc-if: fix possible NULL pointer dereference of resource

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[ 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: ca7d8b980b ("memory: add Renesas RPC-IF driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210407154357.70200-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2021-04-07 17:43:57 +02:00 committed by Greg Kroah-Hartman
parent 73585b2714
commit 71bcc1b4a1
1 changed files with 1 additions and 1 deletions
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drivers/memory/renesas-rpc-if.c
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@ -193,10 +193,10 @@ 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);