From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: linus.walleij@linaro.org, linux-gpio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, john.stultz@linaro.org,
amit.pundir@linaro.org, bjorn.andersson@linaro.org,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: [PATCH v2] gpio: wcd934x: Fix shift-out-of-bounds error
Date: Wed, 10 Mar 2021 17:43:04 +0000 [thread overview]
Message-ID: <20210310174304.22176-1-srinivas.kandagatla@linaro.org> (raw)
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@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
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
next reply other threads:[~2021-03-10 17:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 17:43 Srinivas Kandagatla [this message]
2021-03-10 23:32 ` [PATCH v2] gpio: wcd934x: Fix shift-out-of-bounds error Bjorn Andersson
2021-05-04 12:37 ` Srinivas Kandagatla
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