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

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Date:   Tue, 9 Mar 2021 16:42:35 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>, amit.pundir@...aro.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH] gpio: wcd934x: Fix shift-out-of-bounds error



On 09/03/2021 16:31, Andy Shevchenko wrote:
> On Tue, Mar 9, 2021 at 12:21 PM Srinivas Kandagatla
> <srinivas.kandagatla@...aro.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@...il.com>
> 
>> Fixes: 59c324683400 ("gpio: wcd934x: Add support to wcd934x gpio controller")
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.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
>>
> 
>