Commit 3eb235a1 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso Committed by Greg Kroah-Hartman

netfilter: nft_set_rbtree: handle element re-addition after deletion

commit d2df92e9 upstream.

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: e701001e ("netfilter: nft_rbtree: allow adjacent intervals with dynamic updates")
Reported-by: default avatarWolfgang Bumiller <w.bumiller@proxmox.com>
Tested-by: default avatarWolfgang Bumiller <w.bumiller@proxmox.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a8fc3159
......@@ -118,17 +118,17 @@ 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;
}
}
}
......
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