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| author | Florian Westphal <fw@strlen.de> | 2017-02-08 11:52:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-31 09:49:52 +0200 |
| commit | a9a76a3e318ea559365210916378380109199121 (patch) | |
| tree | 1142811fbd35571b6dd162b7584e3917bd7dc74e /net | |
| parent | 0a5766a6a73b1eb6a0dfa74adc40272e555ac2f0 (diff) | |
| download | linux-stable-a9a76a3e318ea559365210916378380109199121.tar.gz linux-stable-a9a76a3e318ea559365210916378380109199121.tar.bz2 linux-stable-a9a76a3e318ea559365210916378380109199121.zip | |
xfrm: policy: init locks early
commit c282222a45cb9503cbfbebfdb60491f06ae84b49 upstream.
Dmitry reports following splat:
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 13059 Comm: syz-executor1 Not tainted 4.10.0-rc7-next-20170207 #1
[..]
spin_lock_bh include/linux/spinlock.h:304 [inline]
xfrm_policy_flush+0x32/0x470 net/xfrm/xfrm_policy.c:963
xfrm_policy_fini+0xbf/0x560 net/xfrm/xfrm_policy.c:3041
xfrm_net_init+0x79f/0x9e0 net/xfrm/xfrm_policy.c:3091
ops_init+0x10a/0x530 net/core/net_namespace.c:115
setup_net+0x2ed/0x690 net/core/net_namespace.c:291
copy_net_ns+0x26c/0x530 net/core/net_namespace.c:396
create_new_namespaces+0x409/0x860 kernel/nsproxy.c:106
unshare_nsproxy_namespaces+0xae/0x1e0 kernel/nsproxy.c:205
SYSC_unshare kernel/fork.c:2281 [inline]
Problem is that when we get error during xfrm_net_init we will call
xfrm_policy_fini which will acquire xfrm_policy_lock before it was
initialized. Just move it around so locks get set up first.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: 283bc9f35bbbcb0e9 ("xfrm: Namespacify xfrm state/policy locks")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index b5e665b3cfb0..36a50ef9295d 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -3030,6 +3030,11 @@ static int __net_init xfrm_net_init(struct net *net) { int rv; + /* Initialize the per-net locks here */ + spin_lock_init(&net->xfrm.xfrm_state_lock); + rwlock_init(&net->xfrm.xfrm_policy_lock); + mutex_init(&net->xfrm.xfrm_cfg_mutex); + rv = xfrm_statistics_init(net); if (rv < 0) goto out_statistics; @@ -3046,11 +3051,6 @@ static int __net_init xfrm_net_init(struct net *net) if (rv < 0) goto out; - /* Initialize the per-net locks here */ - spin_lock_init(&net->xfrm.xfrm_state_lock); - rwlock_init(&net->xfrm.xfrm_policy_lock); - mutex_init(&net->xfrm.xfrm_cfg_mutex); - return 0; out: |