netdev - Re: [PATCH net-next] net: microchip: sparx5: prevent uninitialized variable

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Date:   Wed, 16 Nov 2022 07:09:12 +0000
From:   <Daniel.Machon@...rochip.com>
To:     <error27@...il.com>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <Lars.Povlsen@...rochip.com>,
        <Steen.Hegelund@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <netdev@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH net-next] net: microchip: sparx5: prevent uninitialized
 variable

> Smatch complains that:
> 
>     drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c:112
>     sparx5_dcb_apptrust_validate() error: uninitialized symbol 'match'.
> 
> This would only happen if the:
> 
>         if (sparx5_dcb_apptrust_policies[i].nselectors != nselectors)
> 
> condition is always true (they are not equal).  The "nselectors"
> variable comes from dcbnl_ieee_set() and it is a number between 0-256.
> This seems like a probably a real bug.

That is indeed a bug.

Thank you, much appreciated.

> 
> Fixes: 23f8382cd95d ("net: microchip: sparx5: add support for apptrust")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
>  drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c b/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c
> index 8108f3767767..74abb946b2a3 100644
> --- a/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c
> +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c
> @@ -90,7 +90,7 @@ static int sparx5_dcb_app_validate(struct net_device *dev,
>  static int sparx5_dcb_apptrust_validate(struct net_device *dev, u8 *selectors,
>                                         int nselectors, int *err)
>  {
> -       bool match;
> +       bool match = false;
>         int i, ii;
> 
>         for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_policies); i++) {
> --
> 2.35.1
>

Reviewed-by: Daniel Machon <daniel.machon@...rochip.com>