From 8c9836c4419f374080b893937f92932e8d06de61 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Tue, 31 Aug 2021 16:40:18 +0800
Subject: [PATCH] net: w5100: check return value after calling platform_get_resource()
Git-commit: a39ff4a47f3e1da3b036817ef436b1a9be10783a
Patch-mainline: v5.15-rc1
References: stable-5.14.6
[ Upstream commit a39ff4a47f3e1da3b036817ef436b1a9be10783a ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/ethernet/wiznet/w5100.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index 811815f8cd3b..f974e70a82e8 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
--
2.26.2