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

Matteo Croce
2021-04-22T00:00:28Z

On Wed, 21 Apr 2021 15:00:01 +0200
Greg Kroah-Hartman <gregkh@linuxfoundation.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@umn.edu>
> Cc: David S. Miller <davem@davemloft.net>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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