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serial: 8250_aspeed_vuart: Fix potential NULL dereference in aspeed_vuart_probe

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[ Upstream commit 0e0fd55719fa081de6f9e5d9e6cef48efb04d34a ]

platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference.

Fixes: 54da3e381c2b ("serial: 8250_aspeed_vuart: use UPF_IOREMAP to set up register mapping")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220404143842.16960-1-linmq006@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miaoqian Lin 2022-04-04 14:38:40 +00:00 committed by Greg Kroah-Hartman
parent c84fa729f8
commit 923d34ce06
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/8250/8250_aspeed_vuart.c
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@ -429,6 +429,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
timer_setup(&vuart->unthrottle_timer, aspeed_vuart_unthrottle_exp, 0);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
memset(&port, 0, sizeof(port));
port.port.private_data = vuart;