From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 18 Apr 2022 12:21:05 +0200
Subject: netfilter: nft_set_rbtree: overlap detection with element re-addition
 after deletion
Patch-mainline: v5.18-rc5
Git-commit: babc3dc9524f0bcb5a0ec61f3c3639b11508fad6
References: bsc#1176447

This patch fixes spurious EEXIST errors.

Extend d2df92e98a34 ("netfilter: nft_set_rbtree: handle element
re-addition after deletion") to deal with elements with same end flags
in the same transation.

Reset the overlap flag as described by 7c84d41416d8 ("netfilter:
nft_set_rbtree: Detect partial overlaps on insertion").

Fixes: 7c84d41416d8 ("netfilter: nft_set_rbtree: Detect partial overlaps on insertion")
Fixes: d2df92e98a34 ("netfilter: nft_set_rbtree: handle element re-addition after deletion")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/netfilter/nft_set_rbtree.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -348,7 +348,11 @@ static int __nft_rbtree_insert(const str
 				*ext = &rbe->ext;
 				return -EEXIST;
 			} else {
-				p = &parent->rb_left;
+				overlap = false;
+				if (nft_rbtree_interval_end(rbe))
+					p = &parent->rb_left;
+				else
+					p = &parent->rb_right;
 			}
 		}