From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit ae7352d384a552d8c799c242e74a934809990a71 ]
Both IPv6 and 6lowpan are calling inet_frags_fini() too soon.
inet_frags_fini() is dismantling a kmem_cache, that might be needed
later when unregister_pernet_subsys() eventually has to remove
frags queues from hash tables and free them.
This fixes potential use-after-free, and is a prereq for the following patch.
Fixes: d4ad4d22e7ac ("inet: frags: use kmem_cache for inet_frag_queue")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/ieee802154/6lowpan/reassembly.c | 2 +-
net/ipv6/reassembly.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index c01df341b5f6..5936bfafb1c4 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -633,7 +633,7 @@ int __init lowpan_net_frag_init(void)
void lowpan_net_frag_exit(void)
{
- inet_frags_fini(&lowpan_frags);
lowpan_frags_sysctl_unregister();
unregister_pernet_subsys(&lowpan_frags_ops);
+ inet_frags_fini(&lowpan_frags);
}
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 4aed9c45a91a..3f488555999e 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -592,8 +592,8 @@ int __init ipv6_frag_init(void)
void ipv6_frag_exit(void)
{
- inet_frags_fini(&ip6_frags);
ip6_frags_sysctl_unregister();
unregister_pernet_subsys(&ip6_frags_ops);
inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
+ inet_frags_fini(&ip6_frags);
}
--
2.20.1
