From: Yang Yingliang <yangyingliang@huawei.com>
Date: Tue, 31 Aug 2021 08:40:18 +0000 (+0800)
Subject: net: w5100: check return value after calling platform_get_resource()
X-Git-Tag: v5.15~428^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a39ff4a47f3e1da3b036817ef436b1a9be10783a;p=platform%2Fkernel%2Flinux-starfive.git

net: w5100: check return value after calling platform_get_resource()

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index 811815f..f974e70 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -1047,6 +1047,8 @@ static int w5100_mmio_probe(struct platform_device *pdev)
 		mac_addr = data->mac_addr;
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -EINVAL;
 	if (resource_size(mem) < W5100_BUS_DIRECT_SIZE)
 		ops = &w5100_mmio_indirect_ops;
 	else