Re: [PATCH 4.4 24/36] netlink: ensure to loop over all netns in genlmsg_multicast_allns()

On Fri, 2018-03-09 at 16:18 -0800, Greg Kroah-Hartman wrote:

4.4-stable review patch.  If anyone has any objections, please let me know.

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From: Nicolas Dichtel nicolas.dichtel@6wind.com

[ Upstream commit cb9f7a9a5c96a773bbc9c70660dc600cfff82f82 ]

[...]

• return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags);

• err = nlmsg_multicast(prev->genl_sock, skb, portid, group, flags);
• if (!err)

• delivered = true;
  

• else if (err != -ESRCH)

• goto error;
  

This call to nlmsg_multicast() consumes skb rather than a clone, so we must not free it again here.

Ben.

• return delivered ? 0 : -ESRCH;

error:   kfree_skb(skb);   return err;