linux-kernel - Re: [PATCH] rtl2832: remove compiler warning

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 10 Feb 2015 12:57:24 +0200
From:	Antti Palosaari <crope@....fi>
To:	Luis de Bethencourt <luis@...ethencourt.com>,
	linux-media@...r.kernel.org
CC:	mchehab@....samsung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtl2832: remove compiler warning

On 02/09/2015 12:44 AM, Luis de Bethencourt wrote:
> Cleaning the following compiler warning:
> rtl2832.c:703:12: warning: 'tmp' may be used uninitialized in this function
>
> Even though it could never happen since if rtl2832_rd_demod_reg () doesn't set
> tmp, this line would never run because we go to err. It is still nice to avoid
> compiler warnings.
>
> Signed-off-by: Luis de Bethencourt <luis.bg@...sung.com>
> ---
>   drivers/media/dvb-frontends/rtl2832.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c
> index 5d2d8f4..ad36d1c 100644
> --- a/drivers/media/dvb-frontends/rtl2832.c
> +++ b/drivers/media/dvb-frontends/rtl2832.c
> @@ -685,7 +685,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, fe_status_t *status)
>   	struct rtl2832_dev *dev = fe->demodulator_priv;
>   	struct i2c_client *client = dev->client;
>   	int ret;
> -	u32 tmp;
> +	u32 tmp = 0;
>
>   	dev_dbg(&client->dev, "\n");

I looked the code and I cannot see how it could used as uninitialized. 
Dunno how it could be fixed properly.

Also, I think idiom to say compiler that variable could be uninitialized 
is to store its own value. But I am fine with zero initialization too.

u32 tmp = tmp;

regards
Antti

-- 
http://palosaari.fi/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/