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authorPablo Neira Ayuso <pablo@netfilter.org>2017-05-21 00:37:10 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2017-05-23 22:54:14 +0200
commitd2df92e98a34a5619dadd29c6291113c009181e7 (patch)
treed695906ddc133bee6c113f495eb1be9818ab02c3 /net
parentnetfilter: conntrack: fix false CRC32c mismatch using paged skb (diff)
downloadlinux-d2df92e98a34a5619dadd29c6291113c009181e7.tar.xz
linux-d2df92e98a34a5619dadd29c6291113c009181e7.zip
netfilter: nft_set_rbtree: handle element re-addition after deletion
The existing code selects no next branch to be inspected when re-inserting an inactive element into the rb-tree, looping endlessly. This patch restricts the check for active elements to the EEXIST case only. Fixes: e701001e7cbe ("netfilter: nft_rbtree: allow adjacent intervals with dynamic updates") Reported-by: Wolfgang Bumiller <w.bumiller@proxmox.com> Tested-by: Wolfgang Bumiller <w.bumiller@proxmox.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nft_set_rbtree.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index e97e2fb53f0a..fbdbaa00dd5f 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -116,17 +116,17 @@ static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set,
else if (d > 0)
p = &parent->rb_right;
else {
- if (nft_set_elem_active(&rbe->ext, genmask)) {
- if (nft_rbtree_interval_end(rbe) &&
- !nft_rbtree_interval_end(new))
- p = &parent->rb_left;
- else if (!nft_rbtree_interval_end(rbe) &&
- nft_rbtree_interval_end(new))
- p = &parent->rb_right;
- else {
- *ext = &rbe->ext;
- return -EEXIST;
- }
+ if (nft_rbtree_interval_end(rbe) &&
+ !nft_rbtree_interval_end(new)) {
+ p = &parent->rb_left;
+ } else if (!nft_rbtree_interval_end(rbe) &&
+ nft_rbtree_interval_end(new)) {
+ p = &parent->rb_right;
+ } else if (nft_set_elem_active(&rbe->ext, genmask)) {
+ *ext = &rbe->ext;
+ return -EEXIST;
+ } else {
+ p = &parent->rb_left;
}
}
}