linux-kernel - Re: [PATCH][next] mlxsw: spectrum: fix uninitialized value in err

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Date:   Sun, 1 Oct 2017 19:42:34 +0300
From:   Yotam Gigi <yotamg@...lanox.com>
To:     Colin King <colin.king@...onical.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mlxsw: spectrum: fix uninitialized value in err

On 10/01/2017 07:27 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> In the unlikely event that mfc->mfc_un.res.ttls[i] is 255 for all
> values of i from 0 to MAXIVS-1, the err is not set at all and hence
> has a garbage value on the error return at the end of the function,
> so initialize it to 0.  Also, the error return check on err and goto
> to err: inside the for loop makes it impossible for err to be zero
> at the end of the for loop, so we can remove the redundant err check
> at the end of the loop.
>
> Detected by CoverityScan CID#1457207 ("Unitialized scalar value")

Thanks for that!

Reviewed-by: Yotam Gigi <yotamg@...lanox.com>


>
> Fixes: c011ec1bbfd6 ("mlxsw: spectrum: Add the multicast routing offloading logic")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c
> index 09120259a45d..4aaf6ca1be7c 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c
> @@ -349,7 +349,7 @@ mlxsw_sp_mr_route4_create(struct mlxsw_sp_mr_table *mr_table,
>  {
>  	struct mlxsw_sp_mr_route_vif_entry *rve, *tmp;
>  	struct mlxsw_sp_mr_route *mr_route;
> -	int err;
> +	int err = 0;
>  	int i;
>  
>  	/* Allocate and init a new route and fill it with parameters */
> @@ -376,8 +376,6 @@ mlxsw_sp_mr_route4_create(struct mlxsw_sp_mr_table *mr_table,
>  		}
>  	}
>  	mlxsw_sp_mr_route_ivif_link(mr_route, &mr_table->vifs[mfc->mfc_parent]);
> -	if (err)
> -		goto err;
>  
>  	mr_route->route_action = mlxsw_sp_mr_route_action(mr_route);
>  	return mr_route;