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

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[ Upstream commit a39ff4a47f ]

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>
This commit is contained in:
Yang Yingliang 2021-08-31 16:40:18 +08:00 • committed by Greg Kroah-Hartman
commit fb1ee02787
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/wiznet/w5100.c
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@ -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