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netfilter: nft_rbtree: fix locking
Fix a race condition and unnecessary locking: * the root rb_node must only be accessed under the lock in nft_rbtree_lookup() * the lock is not needed in lookup functions in netlink context Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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8d0451638a
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1 changed files with 2 additions and 4 deletions
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@ -37,10 +37,11 @@ static bool nft_rbtree_lookup(const struct nft_set *set,
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{
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const struct nft_rbtree *priv = nft_set_priv(set);
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const struct nft_rbtree_elem *rbe, *interval = NULL;
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const struct rb_node *parent = priv->root.rb_node;
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const struct rb_node *parent;
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int d;
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spin_lock_bh(&nft_rbtree_lock);
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parent = priv->root.rb_node;
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while (parent != NULL) {
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rbe = rb_entry(parent, struct nft_rbtree_elem, node);
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@ -158,7 +159,6 @@ static int nft_rbtree_get(const struct nft_set *set, struct nft_set_elem *elem)
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struct nft_rbtree_elem *rbe;
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int d;
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spin_lock_bh(&nft_rbtree_lock);
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while (parent != NULL) {
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rbe = rb_entry(parent, struct nft_rbtree_elem, node);
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@ -173,11 +173,9 @@ static int nft_rbtree_get(const struct nft_set *set, struct nft_set_elem *elem)
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!(rbe->flags & NFT_SET_ELEM_INTERVAL_END))
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nft_data_copy(&elem->data, rbe->data);
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elem->flags = rbe->flags;
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spin_unlock_bh(&nft_rbtree_lock);
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return 0;
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}
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}
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spin_unlock_bh(&nft_rbtree_lock);
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return -ENOENT;
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}
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