[PATCH AUTOSEL 5.4 109/109] net: w5100: check return value after calling platform_get_resource()

Sasha Levin
2021-09-09T13:06:35Z

From: Yang Yingliang <yangyingliang@huawei.com>

[ 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>
---
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 bede1ff289c5..a65b7291e12a 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -1052,6 +1052,8 @@ 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
--
2.30.2