linux-kernel - Re: [PATCH 126/190] Revert "net: openvswitch: fix a NULL pointer dereference"

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Date:   Thu, 22 Apr 2021 01:59:57 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 126/190] Revert "net: openvswitch: fix a NULL pointer
 dereference"

On Wed, 21 Apr 2021 15:00:01 +0200
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> This reverts commit 6f19893b644a9454d85e593b5e90914e7a72b7dd.
> 
> 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: Kangjie Lu <kjlu@....edu>
> Cc: David S. Miller <davem@...emloft.net>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  net/openvswitch/datapath.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index 9d6ef6cb9b26..99e63f4bbcaf 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -443,10 +443,6 @@ static int queue_userspace_packet(struct
> datapath *dp, struct sk_buff *skb, 
>  	upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
>  			     0, upcall_info->cmd);
> -	if (!upcall) {
> -		err = -EINVAL;
> -		goto out;
> -	}
>  	upcall->dp_ifindex = dp_ifindex;
>  
>  	err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false,
> user_skb);

This patch seems good to me, but given the situation I'd like another
pair of eyes on it, at least.

Regards,
-- 
per aspera ad upstream