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xfrm6_tunnel: Fix potential panic when unloading xfrm6_tunnel module 

commit 6ee02a54ef990a71bf542b6f0a4e3321de9d9c66 upstream.

When unloading xfrm6_tunnel module, xfrm6_tunnel_fini directly
frees the xfrm6_tunnel_spi_kmem. Maybe someone has gotten the
xfrm6_tunnel_spi, so need to wait it.

Fixes: 91cc3bb0b04ff("xfrm6_tunnel: RCU conversion")
Change-Id: I084c335865fcb7ca993461e2a6758d49ebe08b3b
Signed-off-by: Su Yanjun <suyj.fnst@cn.fujitsu.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Su Yanjun 2019-03-14 14:59:42 +08:00 committed by L R
parent 240b5593e7
commit 28d5b247b9
1 changed files with 4 additions and 0 deletions
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4
net/ipv6/xfrm6_tunnel.c
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@ -391,6 +391,10 @@ static void __exit xfrm6_tunnel_fini(void)
xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
/* Someone maybe has gotten the xfrm6_tunnel_spi.
* So need to wait it.
*/
rcu_barrier();
kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
}