From e959d8121fcbfee6ec049cc617e9423d1799f2e4 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Fri, 28 Apr 2006 15:32:29 -0700 Subject: [PATCH] [XFRM]: fix incorrect xfrm_policy_afinfo_lock use xfrm_policy_afinfo_lock can be taken in bh context, at: [] lockdep_acquire_read+0x54/0x6d [] _read_lock+0x15/0x22 [] xfrm_policy_get_afinfo+0x1a/0x3d [] xfrm_decode_session+0x12/0x32 [] ip_route_me_harder+0x1c9/0x25b [] ip_nat_local_fn+0x94/0xad [] nf_iterate+0x2e/0x7a [] nf_hook_slow+0x3c/0x9e [] ip_push_pending_frames+0x2de/0x3a7 [] icmp_push_reply+0x136/0x141 [] icmp_reply+0x118/0x1a0 [] icmp_echo+0x44/0x46 [] icmp_rcv+0x111/0x138 [] ip_local_deliver+0x150/0x1f9 [] ip_rcv+0x3d5/0x413 [] netif_receive_skb+0x337/0x356 [] process_backlog+0x95/0x110 [] net_rx_action+0xa5/0x16d [] __do_softirq+0x6f/0xe6 [] do_softirq+0x52/0xb1 this means that all write-locking of xfrm_policy_afinfo_lock must be bh-safe. This patch fixes xfrm_policy_register_afinfo() and xfrm_policy_unregister_afinfo(). Signed-off-by: Ingo Molnar Signed-off-by: David S. Miller --- net/xfrm/xfrm_policy.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index e5b0afc94f1e..b469c8b54613 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1251,7 +1251,7 @@ int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) return -EINVAL; if (unlikely(afinfo->family >= NPROTO)) return -EAFNOSUPPORT; - write_lock(&xfrm_policy_afinfo_lock); + write_lock_bh(&xfrm_policy_afinfo_lock); if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) err = -ENOBUFS; else { @@ -1268,7 +1268,7 @@ int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) afinfo->garbage_collect = __xfrm_garbage_collect; xfrm_policy_afinfo[afinfo->family] = afinfo; } - write_unlock(&xfrm_policy_afinfo_lock); + write_unlock_bh(&xfrm_policy_afinfo_lock); return err; } EXPORT_SYMBOL(xfrm_policy_register_afinfo); @@ -1280,7 +1280,7 @@ int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) return -EINVAL; if (unlikely(afinfo->family >= NPROTO)) return -EAFNOSUPPORT; - write_lock(&xfrm_policy_afinfo_lock); + write_lock_bh(&xfrm_policy_afinfo_lock); if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) err = -EINVAL; @@ -1294,7 +1294,7 @@ int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) afinfo->garbage_collect = NULL; } } - write_unlock(&xfrm_policy_afinfo_lock); + write_unlock_bh(&xfrm_policy_afinfo_lock); return err; } EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); -- 2.20.1