linux-kernel - Re: [PATCH] ibmvnic: fix: NULL pointer dereference.

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Date:   Wed, 30 Dec 2020 14:48:06 +0100
From:   Michal Suchánek <msuchanek@...e.de>
To:     YANG LI <abaci-bugfix@...ux.alibaba.com>
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, ljp@...ux.ibm.com, drt@...ux.ibm.com,
        kuba@...nel.org, sukadev@...ux.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, paulus@...ba.org
Subject: Re: [PATCH] ibmvnic: fix: NULL pointer dereference.

On Wed, Dec 30, 2020 at 03:23:14PM +0800, YANG LI wrote:
> The error is due to dereference a null pointer in function
> reset_one_sub_crq_queue():
> 
> if (!scrq) {
>     netdev_dbg(adapter->netdev,
>                "Invalid scrq reset. irq (%d) or msgs(%p).\n",
> 		scrq->irq, scrq->msgs);
> 		return -EINVAL;
> }
> 
> If the expression is true, scrq must be a null pointer and cannot
> dereference.
> 
> Signed-off-by: YANG LI <abaci-bugfix@...ux.alibaba.com>
> Reported-by: Abaci <abaci@...ux.alibaba.com>
Fixes: 9281cf2d5840 ("ibmvnic: avoid memset null scrq msgs")
> ---
>  drivers/net/ethernet/ibm/ibmvnic.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
> index f302504..d7472be 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -2981,9 +2981,7 @@ static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
>  	int rc;
>  
>  	if (!scrq) {
> -		netdev_dbg(adapter->netdev,
> -			   "Invalid scrq reset. irq (%d) or msgs (%p).\n",
> -			   scrq->irq, scrq->msgs);
> +		netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
>  		return -EINVAL;
>  	}
>  
> -- 
> 1.8.3.1
>