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authorWANG Cong <xiyou.wangcong@gmail.com>2016-10-20 09:35:12 +0300
committerDavid S. Miller <davem@davemloft.net>2016-10-21 18:29:02 +0300
commit8651be8f14a12d24f203f283601d9b0418c389ff (patch)
tree15f086903cd41889f29e23ac2f80d8bb77f7ead4 /include/net/addrconf.h
parent8dbad1a81128f7e224fce3cce28a1d545d9c0b88 (diff)
downloadlinux-8651be8f14a12d24f203f283601d9b0418c389ff.tar.xz
ipv6: fix a potential deadlock in do_ipv6_setsockopt()
Baozeng reported this deadlock case: CPU0 CPU1 ---- ---- lock([ 165.136033] sk_lock-AF_INET6); lock([ 165.136033] rtnl_mutex); lock([ 165.136033] sk_lock-AF_INET6); lock([ 165.136033] rtnl_mutex); Similar to commit 87e9f0315952 ("ipv4: fix a potential deadlock in mcast getsockopt() path") this is due to we still have a case, ipv6_sock_mc_close(), where we acquire sk_lock before rtnl_lock. Close this deadlock with the similar solution, that is always acquire rtnl lock first. Fixes: baf606d9c9b1 ("ipv4,ipv6: grab rtnl before locking the socket") Reported-by: Baozeng Ding <sploving1@gmail.com> Tested-by: Baozeng Ding <sploving1@gmail.com> Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/addrconf.h')
-rw-r--r--include/net/addrconf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index f2d072787947..8f998afc1384 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -174,6 +174,7 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex,
const struct in6_addr *addr);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
const struct in6_addr *addr);
+void __ipv6_sock_mc_close(struct sock *sk);
void ipv6_sock_mc_close(struct sock *sk);
bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
const struct in6_addr *src_addr);