linux-kernel - [PATCH 5.15 131/201] gpio: gpio-xilinx: Fix integer overflow

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Date:   Wed, 27 Jul 2022 18:10:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Srinivas Neeli <srinivas.neeli@...inx.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 131/201] gpio: gpio-xilinx: Fix integer overflow

From: Srinivas Neeli <srinivas.neeli@...inx.com>

[ Upstream commit 32c094a09d5829ad9b02cdf667569aefa8de0ea6 ]

Current implementation is not able to configure more than 32 pins
due to incorrect data type. So type casting with unsigned long
to avoid it.

Fixes: 02b3f84d9080 ("xilinx: Switch to use bitmap APIs")
Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-xilinx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index a1b66338d077..db616ae560a3 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -99,7 +99,7 @@ static inline void xgpio_set_value32(unsigned long *map, int bit, u32 v)
 	const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5);
 
 	map[index] &= ~(0xFFFFFFFFul << offset);
-	map[index] |= v << offset;
+	map[index] |= (unsigned long)v << offset;
 }
 
 static inline int xgpio_regoffset(struct xgpio_instance *chip, int ch)
-- 
2.35.1