4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Sabrina Dubroca <s...@queasysnail.net>

commit 2f10a61cee8fdb9f8da90f5db687e1862b22cf06 upstream.

request_module can sleep, thus we cannot hold rcu_read_lock() while
calling it. The function also jumps back and takes rcu_read_lock()
again (in xfrm_state_get_afinfo()), resulting in an imbalance.

This codepath is triggered whenever a new offloaded state is created.

Fixes: ffdb5211da1c ("xfrm: Auto-load xfrm offload modules")
Reported-by: 
syzbot+ca425f44816d749e8eb49755567a75ee48cf4...@syzkaller.appspotmail.com
Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 net/xfrm/xfrm_state.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -313,13 +313,14 @@ retry:
        if ((type && !try_module_get(type->owner)))
                type = NULL;
 
+       rcu_read_unlock();
+
        if (!type && try_load) {
                request_module("xfrm-offload-%d-%d", family, proto);
                try_load = 0;
                goto retry;
        }
 
-       rcu_read_unlock();
        return type;
 }
 


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