[PATCH 06/10] xfrm: check all hash buckets for leftover states during netns deletion

[Steffen Klassert <steffen.klassert@secunet.com>]

From: Sabrina Dubroca <sd@queasysnail.net>

The current hlist_empty checks only test the first bucket of each
hashtable, ignoring any other bucket. They should be caught by the
WARN_ON for state_all, but better to make all the checks accurate.

Fixes: 73d189dce486 ("netns xfrm: per-netns xfrm_state_bydst hash")
Fixes: d320bbb306f2 ("netns xfrm: per-netns xfrm_state_bysrc hash")
Fixes: b754a4fd8f58 ("netns xfrm: per-netns xfrm_state_byspi hash")
Fixes: fe9f1d8779cb ("xfrm: add state hashtable keyed by seq")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
 net/xfrm/xfrm_state.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index c3518d1498cd..9e14e453b55c 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -3308,6 +3308,7 @@ int __net_init xfrm_state_init(struct net *net)
 void xfrm_state_fini(struct net *net)
 {
 	unsigned int sz;
+	int i;
 
 	flush_work(&net->xfrm.state_hash_work);
 	xfrm_state_flush(net, 0, false);
@@ -3315,14 +3316,17 @@ void xfrm_state_fini(struct net *net)
 
 	WARN_ON(!list_empty(&net->xfrm.state_all));
 
+	for (i = 0; i <= net->xfrm.state_hmask; i++) {
+		WARN_ON(!hlist_empty(net->xfrm.state_byseq + i));
+		WARN_ON(!hlist_empty(net->xfrm.state_byspi + i));
+		WARN_ON(!hlist_empty(net->xfrm.state_bysrc + i));
+		WARN_ON(!hlist_empty(net->xfrm.state_bydst + i));
+	}
+
 	sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
-	WARN_ON(!hlist_empty(net->xfrm.state_byseq));
 	xfrm_hash_free(net->xfrm.state_byseq, sz);
-	WARN_ON(!hlist_empty(net->xfrm.state_byspi));
 	xfrm_hash_free(net->xfrm.state_byspi, sz);
-	WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
 	xfrm_hash_free(net->xfrm.state_bysrc, sz);
-	WARN_ON(!hlist_empty(net->xfrm.state_bydst));
 	xfrm_hash_free(net->xfrm.state_bydst, sz);
 	free_percpu(net->xfrm.state_cache_input);
 }
-- 
2.43.0