netdev - Re: [PATCH] net/mlx4: Check retval of mlx4_bitmap

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Message-ID: <d3d9737f-381b-0156-a352-fa5d4fdf8a9f@gmail.com>
Date:   Tue, 15 Nov 2022 15:03:58 +0200
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Peter Kosyh <pkosyh@...dex.ru>, Tariq Toukan <tariqt@...dia.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] net/mlx4: Check retval of mlx4_bitmap_init



On 11/15/2022 11:53 AM, Peter Kosyh wrote:
> If mlx4_bitmap_init fails, mlx4_bitmap_alloc_range will dereference
> the NULL pointer (bitmap->table).
> 
> Make sure, that mlx4_bitmap_alloc_range called in no error case.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Peter Kosyh <pkosyh@...dex.ru>
> ---
>   drivers/net/ethernet/mellanox/mlx4/qp.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/qp.c b/drivers/net/ethernet/mellanox/mlx4/qp.c
> index b149e601f673..48cfaa7eaf50 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/qp.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/qp.c
> @@ -697,7 +697,8 @@ static int mlx4_create_zones(struct mlx4_dev *dev,
>   			err = mlx4_bitmap_init(*bitmap + k, 1,
>   					       MLX4_QP_TABLE_RAW_ETH_SIZE - 1, 0,
>   					       0);
> -			mlx4_bitmap_alloc_range(*bitmap + k, 1, 1, 0);
> +			if (!err)
> +				mlx4_bitmap_alloc_range(*bitmap + k, 1, 1, 0);
>   		}
>   
>   		if (err)

Reviewed-by: Tariq Toukan <tariqt@...dia.com>

Thanks for your patch.