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authorVlad Buslov <vladbu@mellanox.com>2019-04-11 19:12:20 +0300
committerDavid S. Miller <davem@davemloft.net>2019-04-11 21:33:06 +0300
commit9e35552ae1eafd666e7388a1a94a321665d2f911 (patch)
tree223a5827f38bd0256a9bfd158114ff4f083b0604 /net/sched
parentecce39ec10937fb0d9f34ab43c75482d6c243292 (diff)
downloadlinux-9e35552ae1eafd666e7388a1a94a321665d2f911.tar.xz
net: sched: flower: use correct ht function to prevent duplicates
Implementation of function rhashtable_insert_fast() check if its internal helper function __rhashtable_insert_fast() returns non-NULL pointer and seemingly return -EEXIST in such case. However, since __rhashtable_insert_fast() is called with NULL key pointer, it never actually checks for duplicates, which means that -EEXIST is never returned to the user. Use rhashtable_lookup_insert_fast() hash table API instead. In order to verify that it works as expected and prevent the problem from happening in future, extend tc-tests with new test that verifies that no new filters with existing key can be inserted to flower classifier. Fixes: 1f17f7742eeb ("net: sched: flower: insert filter to ht before offloading it to hw") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/cls_flower.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 2763176e369c..9cd8122a5c38 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1466,9 +1466,9 @@ static int fl_ht_insert_unique(struct cls_fl_filter *fnew,
struct fl_flow_mask *mask = fnew->mask;
int err;
- err = rhashtable_insert_fast(&mask->ht,
- &fnew->ht_node,
- mask->filter_ht_params);
+ err = rhashtable_lookup_insert_fast(&mask->ht,
+ &fnew->ht_node,
+ mask->filter_ht_params);
if (err) {
*in_ht = false;
/* It is okay if filter with same key exists when