linux-kernel - [PATCH 5.12 149/173] gpio: wcd934x: Fix shift-out-of-bounds error

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Message-Id: <20210614102703.128539930@linuxfoundation.org>
Date:   Mon, 14 Jun 2021 12:28:01 +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 Kandagatla <srinivas.kandagatla@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 5.12 149/173] gpio: wcd934x: Fix shift-out-of-bounds error

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

commit dbec64b11c65d74f31427e2b9d5746fbf17bf840 upstream.

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>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpio/gpio-wcd934x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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