This is a note to let you know that I've just added the patch titled
rhashtable: Fix rhlist duplicates insertion
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: rhashtable-fix-rhlist-duplicates-insertion.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Wed Mar 28 18:37:51 CEST 2018
From: Paul Blakey paulb@mellanox.com Date: Sun, 4 Mar 2018 17:29:48 +0200 Subject: rhashtable: Fix rhlist duplicates insertion
From: Paul Blakey paulb@mellanox.com
[ Upstream commit d3dcf8eb615537526bd42ff27a081d46d337816e ]
When inserting duplicate objects (those with the same key), current rhlist implementation messes up the chain pointers by updating the bucket pointer instead of prev next pointer to the newly inserted node. This causes missing elements on removal and travesal.
Fix that by properly updating pprev pointer to point to the correct rhash_head next pointer.
Issue: 1241076 Change-Id: I86b2c140bcb4aeb10b70a72a267ff590bb2b17e7 Fixes: ca26893f05e8 ('rhashtable: Add rhlist interface') Signed-off-by: Paul Blakey paulb@mellanox.com Acked-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/rhashtable.h | 4 +++- lib/rhashtable.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-)
--- a/include/linux/rhashtable.h +++ b/include/linux/rhashtable.h @@ -750,8 +750,10 @@ slow_path: if (!key || (params.obj_cmpfn ? params.obj_cmpfn(&arg, rht_obj(ht, head)) : - rhashtable_compare(&arg, rht_obj(ht, head)))) + rhashtable_compare(&arg, rht_obj(ht, head)))) { + pprev = &head->next; continue; + }
data = rht_obj(ht, head);
--- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -537,8 +537,10 @@ static void *rhashtable_lookup_one(struc if (!key || (ht->p.obj_cmpfn ? ht->p.obj_cmpfn(&arg, rht_obj(ht, head)) : - rhashtable_compare(&arg, rht_obj(ht, head)))) + rhashtable_compare(&arg, rht_obj(ht, head)))) { + pprev = &head->next; continue; + }
if (!ht->rhlist) return rht_obj(ht, head);
Patches currently in stable-queue which might be from paulb@mellanox.com are
queue-4.15/rhashtable-fix-rhlist-duplicates-insertion.patch queue-4.15/test_rhashtable-add-test-case-for-rhltable-with-duplicate-objects.patch