netlink: avoid a double skb free in genlmsg_mcast()
authorNicolas Dichtel <nicolas.dichtel@6wind.com>
Wed, 14 Mar 2018 20:10:23 +0000 (21:10 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 31 Mar 2018 16:10:41 +0000 (18:10 +0200)
commit06d3f43d52bbf58dd040c7612ac7372cf6649208
tree6e9bb8eccbb5009dd46af773ab55ebc62e98901f
parent2980f37b6111557c2d8dbb08bce2e14bdbb83fb2
netlink: avoid a double skb free in genlmsg_mcast()

[ Upstream commit 02a2385f37a7c6594c9d89b64c4a1451276f08eb ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/netlink/genetlink.c