xfrm6_tunnel: Fix potential panic when unloading xfrm6_tunnel module
[ Upstream commit 6ee02a54ef990a71bf542b6f0a4e3321de9d9c66 ] 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") 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: Sasha Levin <sashal@kernel.org>
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@ -391,6 +391,10 @@ static void __exit xfrm6_tunnel_fini(void)
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xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
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xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
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unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
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/* Someone maybe has gotten the xfrm6_tunnel_spi.
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* So need to wait it.
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*/
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rcu_barrier();
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kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
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}
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