From: Wei Yongjun weiyongjun1@huawei.com
[ Upstream commit e00edb4efbbc07425441a3be2aa87abaf5800d96 ]
platform_get_resource() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference since devm_ioremap() does not check input parameters for null.
This is detected by Coccinelle semantic patch.
@@ expression pdev, res, n, t, e, e1, e2; @@
res = (platform_get_resource|platform_get_resource_byname)(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2);
Fixes: 03f66f067560 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()") Signed-off-by: Wei Yongjun weiyongjun1@huawei.com Reviewed-by: Grygorii Strashko grygorii.strashko@ti.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ti/davinci_mdio.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c index 38b7f6d35759..702fdc393da0 100644 --- a/drivers/net/ethernet/ti/davinci_mdio.c +++ b/drivers/net/ethernet/ti/davinci_mdio.c @@ -397,6 +397,8 @@ static int davinci_mdio_probe(struct platform_device *pdev) data->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; data->regs = devm_ioremap(dev, res->start, resource_size(res)); if (!data->regs) return -ENOMEM;