linux-kernel - [RESEND PATCH v2] gpio: wcd934x: Fix shift-out-of-bounds error

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Date:   Tue, 25 May 2021 17:55:39 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.stultz@...aro.org, amit.pundir@...aro.org,
        bjorn.andersson@...aro.org, andy.shevchenko@...il.com,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [RESEND PATCH v2] gpio: wcd934x: Fix shift-out-of-bounds error

bit-mask for pins 0 to 4 is BIT(0) to BIT(4) however we ended up with BIT(n - 1)
which is not right, and this was caught by below usban check

UBSAN: shift-out-of-bounds in drivers/gpio/gpio-wcd934x.c:34:14

Fixes: 59c324683400 ("gpio: wcd934x: Add support to wcd934x gpio controller")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
changes since v1:
	- removed unnecessary dump stack from log

 drivers/gpio/gpio-wcd934x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-wcd934x.c b/drivers/gpio/gpio-wcd934x.c
index 1cbce5990855..97e6caedf1f3 100644
--- a/drivers/gpio/gpio-wcd934x.c
+++ b/drivers/gpio/gpio-wcd934x.c
@@ -7,7 +7,7 @@
 #include <linux/slab.h>
 #include <linux/of_device.h>
 
-#define WCD_PIN_MASK(p) BIT(p - 1)
+#define WCD_PIN_MASK(p) BIT(p)
 #define WCD_REG_DIR_CTL_OFFSET 0x42
 #define WCD_REG_VAL_CTL_OFFSET 0x43
 #define WCD934X_NPINS		5
-- 
2.21.0