[XFRM]: fix incorrect xfrm_state_afinfo_lock use

xfrm_state_afinfo_lock can be read-locked from bh context, so take it
in a bh-safe manner in xfrm_state_register_afinfo() and
xfrm_state_unregister_afinfo(). Found by the lock validator.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 3dc3e1f3b7a..93a2f36ad3d 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1061,7 +1061,7 @@ int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
                 return -EINVAL;
         if (unlikely(afinfo->family >= NPROTO))
                 return -EAFNOSUPPORT;
-        write_lock(&xfrm_state_afinfo_lock);
+        write_lock_bh(&xfrm_state_afinfo_lock);
         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
                 err = -ENOBUFS;
         else {
@@ -1069,7 +1069,7 @@ int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
                 afinfo->state_byspi = xfrm_state_byspi;
                 xfrm_state_afinfo[afinfo->family] = afinfo;
         }
-        write_unlock(&xfrm_state_afinfo_lock);
+        write_unlock_bh(&xfrm_state_afinfo_lock);
         return err;
 }
 EXPORT_SYMBOL(xfrm_state_register_afinfo);
@@ -1081,7 +1081,7 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
                 return -EINVAL;
         if (unlikely(afinfo->family >= NPROTO))
                 return -EAFNOSUPPORT;
-        write_lock(&xfrm_state_afinfo_lock);
+        write_lock_bh(&xfrm_state_afinfo_lock);
         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
                         err = -EINVAL;
@@ -1091,7 +1091,7 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
                         afinfo->state_bydst = NULL;
                 }
         }
-        write_unlock(&xfrm_state_afinfo_lock);
+        write_unlock_bh(&xfrm_state_afinfo_lock);
         return err;
 }
 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);