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* [PATCH] gpio: wcd934x: Fix shift-out-of-bounds error
@ 2021-03-09 10:19 Srinivas Kandagatla
  2021-03-09 16:31 ` Andy Shevchenko
  0 siblings, 1 reply; 3+ messages in thread
From: Srinivas Kandagatla @ 2021-03-09 10:19 UTC (permalink / raw)
  To: linus.walleij, linux-gpio
  Cc: linux-kernel, john.stultz, amit.pundir, bjorn.andersson,
	Srinivas Kandagatla

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 /workspace/dev/linux/drivers/gpio/gpio-wcd934x.c:34:14
qcom-q6v5-mss 4080000.remoteproc: failed to acquire pdc reset
remoteproc remoteproc2: releasing 4080000.remoteproc
shift exponent 4294967295 is too large for 64-bit type 'long unsigned int'
CPU: 6 PID: 155 Comm: kworker/6:2 Not tainted 5.12.0-rc1-00045-g508b7280ec3d-dirty #1396
Hardware name: Thundercomm Dragonboard 845c (DT)

Call trace:
 dump_backtrace+0x0/0x1c0
 show_stack+0x18/0x68
 dump_stack+0xd8/0x134
 ubsan_epilogue+0x10/0x58
 __ubsan_handle_shift_out_of_bounds+0xf8/0x168
 wcd_gpio_get_direction+0xc8/0xd8
 gpiochip_add_data_with_key+0x4ac/0xe78
 devm_gpiochip_add_data_with_key+0x30/0x90
 wcd_gpio_probe+0xc8/0x118
 platform_probe+0x6c/0x118
 really_probe+0x24c/0x418
 driver_probe_device+0x68/0xf0
 __device_attach_driver+0xb4/0x110

Fixes: 59c324683400 ("gpio: wcd934x: Add support to wcd934x gpio controller")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 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


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH] gpio: wcd934x: Fix shift-out-of-bounds error
  2021-03-09 10:19 [PATCH] gpio: wcd934x: Fix shift-out-of-bounds error Srinivas Kandagatla
@ 2021-03-09 16:31 ` Andy Shevchenko
  2021-03-09 16:42   ` Srinivas Kandagatla
  0 siblings, 1 reply; 3+ messages in thread
From: Andy Shevchenko @ 2021-03-09 16:31 UTC (permalink / raw)
  To: Srinivas Kandagatla
  Cc: Linus Walleij, open list:GPIO SUBSYSTEM,
	Linux Kernel Mailing List, John Stultz, amit.pundir,
	Bjorn Andersson

On Tue, Mar 9, 2021 at 12:21 PM Srinivas Kandagatla
<srinivas.kandagatla@linaro.org> wrote:
>
> 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

It would be nice to reduce below to ~2-3 (significant) lines.

> UBSAN: shift-out-of-bounds in /workspace/dev/linux/drivers/gpio/gpio-wcd934x.c:34:14
> qcom-q6v5-mss 4080000.remoteproc: failed to acquire pdc reset
> remoteproc remoteproc2: releasing 4080000.remoteproc
> shift exponent 4294967295 is too large for 64-bit type 'long unsigned int'
> CPU: 6 PID: 155 Comm: kworker/6:2 Not tainted 5.12.0-rc1-00045-g508b7280ec3d-dirty #1396
> Hardware name: Thundercomm Dragonboard 845c (DT)
>
> Call trace:
>  dump_backtrace+0x0/0x1c0
>  show_stack+0x18/0x68
>  dump_stack+0xd8/0x134
>  ubsan_epilogue+0x10/0x58
>  __ubsan_handle_shift_out_of_bounds+0xf8/0x168
>  wcd_gpio_get_direction+0xc8/0xd8
>  gpiochip_add_data_with_key+0x4ac/0xe78
>  devm_gpiochip_add_data_with_key+0x30/0x90
>  wcd_gpio_probe+0xc8/0x118
>  platform_probe+0x6c/0x118
>  really_probe+0x24c/0x418
>  driver_probe_device+0x68/0xf0
>  __device_attach_driver+0xb4/0x110

After addressing above, FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> Fixes: 59c324683400 ("gpio: wcd934x: Add support to wcd934x gpio controller")
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
>  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
>


-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH] gpio: wcd934x: Fix shift-out-of-bounds error
  2021-03-09 16:31 ` Andy Shevchenko
@ 2021-03-09 16:42   ` Srinivas Kandagatla
  0 siblings, 0 replies; 3+ messages in thread
From: Srinivas Kandagatla @ 2021-03-09 16:42 UTC (permalink / raw)
  To: Andy Shevchenko
  Cc: Linus Walleij, open list:GPIO SUBSYSTEM,
	Linux Kernel Mailing List, John Stultz, amit.pundir,
	Bjorn Andersson



On 09/03/2021 16:31, Andy Shevchenko wrote:
> On Tue, Mar 9, 2021 at 12:21 PM Srinivas Kandagatla
> <srinivas.kandagatla@linaro.org> wrote:
>>
>> 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
> 
> It would be nice to reduce below to ~2-3 (significant) lines.

I agree! Will do that in next version!

--srini
> 
>> UBSAN: shift-out-of-bounds in /workspace/dev/linux/drivers/gpio/gpio-wcd934x.c:34:14
>> qcom-q6v5-mss 4080000.remoteproc: failed to acquire pdc reset
>> remoteproc remoteproc2: releasing 4080000.remoteproc
>> shift exponent 4294967295 is too large for 64-bit type 'long unsigned int'
>> CPU: 6 PID: 155 Comm: kworker/6:2 Not tainted 5.12.0-rc1-00045-g508b7280ec3d-dirty #1396
>> Hardware name: Thundercomm Dragonboard 845c (DT)
>>
>> Call trace:
>>   dump_backtrace+0x0/0x1c0
>>   show_stack+0x18/0x68
>>   dump_stack+0xd8/0x134
>>   ubsan_epilogue+0x10/0x58
>>   __ubsan_handle_shift_out_of_bounds+0xf8/0x168
>>   wcd_gpio_get_direction+0xc8/0xd8
>>   gpiochip_add_data_with_key+0x4ac/0xe78
>>   devm_gpiochip_add_data_with_key+0x30/0x90
>>   wcd_gpio_probe+0xc8/0x118
>>   platform_probe+0x6c/0x118
>>   really_probe+0x24c/0x418
>>   driver_probe_device+0x68/0xf0
>>   __device_attach_driver+0xb4/0x110
> 
> After addressing above, FWIW,
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> 
>> Fixes: 59c324683400 ("gpio: wcd934x: Add support to wcd934x gpio controller")
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>> ---
>>   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
>>
> 
> 

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-03-09 16:43 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-03-09 10:19 [PATCH] gpio: wcd934x: Fix shift-out-of-bounds error Srinivas Kandagatla
2021-03-09 16:31 ` Andy Shevchenko
2021-03-09 16:42   ` Srinivas Kandagatla

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