[PATCH AUTOSEL 4.14 26/59] serial: 8250_pci: make setup_port() parameters explicitly unsigned

From: Sasha Levin
Date: Thu Sep 09 2021 - 09:11:22 EST

From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit 3a96e97ab4e835078e6f27b7e1c0947814df3841 ]

The bar and offset parameters to setup_port() are used in pointer math,
and while it would be very difficult to get them to wrap as a negative
number, just be "safe" and make them unsigned so that static checkers do
not trip over them unintentionally.

Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
Reported-by: Jordy Zomer <jordy@pwning.systems>
Link: https://lore.kernel.org/r/20210726130717.2052096-1-gregkh@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/tty/serial/8250/8250_pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 071ee37399b7..72015cc7b33f 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -73,7 +73,7 @@ static void moan_device(const char *str, struct pci_dev *dev)

static int
setup_port(struct serial_private *priv, struct uart_8250_port *port,
- int bar, int offset, int regshift)
+ u8 bar, unsigned int offset, int regshift)
struct pci_dev *dev = priv->dev;