linux-kernel - Re: [PATCH] HID: i2c-hid: fix format string mismatch

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Date:   Fri, 14 May 2021 10:40:56 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Julian Sax <jsbc@....de>
Cc:     Arnd Bergmann <arnd@...db.de>, Hans de Goede <hdegoede@...hat.com>,
        Douglas Anderson <dianders@...omium.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Xiaofei Tan <tanxiaofei@...wei.com>,
        Coiby Xu <coiby.xu@...il.com>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] HID: i2c-hid: fix format string mismatch

On 5/14/2021 6:58 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang doesn't like printing a 32-bit integer using %hX format string:
> 
> drivers/hid/i2c-hid/i2c-hid-core.c:994:18: error: format specifies type 'unsigned short' but the argument has type '__u32' (aka 'unsigned int') [-Werror,-Wformat]
>                   client->name, hid->vendor, hid->product);
>                                 ^~~~~~~~~~~
> drivers/hid/i2c-hid/i2c-hid-core.c:994:31: error: format specifies type 'unsigned short' but the argument has type '__u32' (aka 'unsigned int') [-Werror,-Wformat]
>                   client->name, hid->vendor, hid->product);
>                                              ^~~~~~~~~~~~
> 
> Use an explicit cast to truncate it to the low 16 bits instead.
> 
> Fixes: 9ee3e06610fd ("HID: i2c-hid: override HID descriptors for certain devices")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>   drivers/hid/i2c-hid/i2c-hid-core.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
> index 9993133989a5..f9d28ad17d9c 100644
> --- a/drivers/hid/i2c-hid/i2c-hid-core.c
> +++ b/drivers/hid/i2c-hid/i2c-hid-core.c
> @@ -990,8 +990,8 @@ int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
>   	hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
>   	hid->product = le16_to_cpu(ihid->hdesc.wProductID);
>   
> -	snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
> -		 client->name, hid->vendor, hid->product);
> +	snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
> +		 client->name, (u16)hid->vendor, (u16)hid->product);
>   	strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
>   
>   	ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
>