linux-kernel - Re: [PATCH 129/190] Revert "qlcnic: Avoid potential NULL pointer dereference"

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Message-ID: <YIhFCfs0jIRMRgdr@kroah.com>
Date:   Tue, 27 Apr 2021 19:08:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Aditya Pakki <pakki001@....edu>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH 129/190] Revert "qlcnic: Avoid potential NULL pointer
 dereference"

On Wed, Apr 21, 2021 at 03:00:04PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 5bf7295fe34a5251b1d241b9736af4697b590670.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Aditya Pakki <pakki001@....edu>
> Cc: David S. Miller <davem@...emloft.net>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
> index d8a3ecaed3fc..985cf8cb2ec0 100644
> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
> @@ -1047,8 +1047,6 @@ int qlcnic_do_lb_test(struct qlcnic_adapter *adapter, u8 mode)
>  
>  	for (i = 0; i < QLCNIC_NUM_ILB_PKT; i++) {
>  		skb = netdev_alloc_skb(adapter->netdev, QLCNIC_ILB_PKT_SIZE);
> -		if (!skb)
> -			break;
>  		qlcnic_create_loopback_buff(skb->data, adapter->mac_addr);
>  		skb_put(skb, QLCNIC_ILB_PKT_SIZE);
>  		adapter->ahw->diag_cnt = 0;
> -- 
> 2.31.1
> 

This commit does not properly detect if an error happens because the
logic after this loop will not detect that there was a failed
allocation.  I will keep this revert and fix it up properly later.

thanks,

greg k-h