From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Wed, 14 Mar 2018 20:10:23 +0000 (+0100)
Subject: netlink: avoid a double skb free in genlmsg_mcast()
X-Git-Tag: v5.15~9226^2~34
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=02a2385f37a7c6594c9d89b64c4a1451276f08eb;p=mirror_ubuntu-kernels.git

netlink: avoid a double skb free in genlmsg_mcast()

nlmsg_multicast() consumes always the skb, thus the original skb must be
freed only when this function is called with a clone.

Fixes: cb9f7a9a5c96 ("netlink: ensure to loop over all netns in genlmsg_multicast_allns()")
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 6f02499ef007..b9ce82c9440f 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1106,7 +1106,7 @@ static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group,
 	if (!err)
 		delivered = true;
 	else if (err != -ESRCH)
-		goto error;
+		return err;
 	return delivered ? 0 : -ESRCH;
  error:
 	kfree_skb(skb);