4.4-stable review patch. If anyone has any objections, please let me know.
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From: Florian Westphal fw@strlen.de
[ Upstream commit 86126b77dcd551ce223e7293bb55854e3df05646 ]
nlmsg_multicast() always frees the skb, so in case we cannot call it we must do that ourselves.
Fixes: 21ee543edc0dea ("xfrm: fix race between netns cleanup and state expire notification") Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/xfrm/xfrm_user.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
--- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -980,10 +980,12 @@ static inline int xfrm_nlmsg_multicast(s { struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
- if (nlsk) - return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); - else - return -1; + if (!nlsk) { + kfree_skb(skb); + return -EPIPE; + } + + return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); }
static inline size_t xfrm_spdinfo_msgsize(void)