lkml.org 
[lkml]   [2019]   [Aug]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.16 010/157] xfrm6_tunnel: Fix potential panic when unloading xfrm6_tunnel module
3.16.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Su Yanjun <suyj.fnst@cn.fujitsu.com>

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")
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>
---
net/ipv6/xfrm6_tunnel.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/net/ipv6/xfrm6_tunnel.c
+++ b/net/ipv6/xfrm6_tunnel.c
@@ -390,6 +390,10 @@ static void __exit xfrm6_tunnel_fini(voi
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);
}

\
 
 \ /
  Last update: 2019-08-10 22:55    [W:0.345 / U:10.844 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site