linux-kernel - Re: [PATCH] ieee802154/adf7242: check status of adf7242_read

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Message-ID: <cb5859ab-e013-2e45-4871-a8e82235e2ab@datenfreihafen.org>
Date:   Mon, 3 Aug 2020 20:27:22 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     trix@...hat.com, michael.hennerich@...log.com,
        alex.aring@...il.com, davem@...emloft.net, kuba@...nel.org,
        marcel@...tmann.org
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ieee802154/adf7242: check status of adf7242_read_reg

Hello.

On 02.08.20 16:23, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> Clang static analysis reports this error
> 
> adf7242.c:887:6: warning: Assigned value is garbage or undefined
>          len = len_u8;
>              ^ ~~~~~~
> 
> len_u8 is set in
>         adf7242_read_reg(lp, 0, &len_u8);
> 
> When this call fails, len_u8 is not set.
> 
> So check the return code.
> 
> Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC IEEE802154")
> 
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>   drivers/net/ieee802154/adf7242.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
> index c11f32f644db..7db9cbd0f5de 100644
> --- a/drivers/net/ieee802154/adf7242.c
> +++ b/drivers/net/ieee802154/adf7242.c
> @@ -882,7 +882,9 @@ static int adf7242_rx(struct adf7242_local *lp)
>   	int ret;
>   	u8 lqi, len_u8, *data;
>   
> -	adf7242_read_reg(lp, 0, &len_u8);
> +	ret = adf7242_read_reg(lp, 0, &len_u8);
> +	if (ret)
> +		return ret;
>   
>   	len = len_u8;
>   
> 


This patch has been applied to the wpan tree and will be
part of the next pull request to net. Thanks!

regards
Stefan Schmidt