Merge branch 'fix-lpm-map'

Yonghong Song says:

====================
A kernel page fault which happens in lpm map trie_get_next_key is reported
by syzbot and Eric. The issue was introduced by commit b471f2f1de8b
("bpf: implement MAP_GET_NEXT_KEY command for LPM_TRIE map").
Patch #1 fixed the issue in the kernel and patch #2 adds a multithreaded
test case in tools/testing/selftests/bpf/test_lpm_map.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 11 insertions, 15 deletions

diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c
index 8f083ea9d4b9..7b469d10d0e9 100644
--- a/kernel/bpf/lpm_trie.c
+++ b/kernel/bpf/lpm_trie.c
@@ -593,11 +593,10 @@ unlock:
 
 static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key)
 {
+	struct lpm_trie_node *node, *next_node = NULL, *parent, *search_root;
 	struct lpm_trie *trie = container_of(map, struct lpm_trie, map);
 	struct bpf_lpm_trie_key *key = _key, *next_key = _next_key;
-	struct lpm_trie_node *node, *next_node = NULL, *parent;
 	struct lpm_trie_node **node_stack = NULL;
-	struct lpm_trie_node __rcu **root;
 	int err = 0, stack_ptr = -1;
 	unsigned int next_bit;
 	size_t matchlen;
@@ -614,14 +613,13 @@ static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key)
 	 */
 
 	/* Empty trie */
-	if (!rcu_dereference(trie->root))
+	search_root = rcu_dereference(trie->root);
+	if (!search_root)
 		return -ENOENT;
 
 	/* For invalid key, find the leftmost node in the trie */
-	if (!key || key->prefixlen > trie->max_prefixlen) {
-		root = &trie->root;
+	if (!key || key->prefixlen > trie->max_prefixlen)
 		goto find_leftmost;
-	}
 
 	node_stack = kmalloc(trie->max_prefixlen * sizeof(struct lpm_trie_node *),
 			     GFP_ATOMIC | __GFP_NOWARN);
@@ -629,7 +627,7 @@ static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key)
 		return -ENOMEM;
 
 	/* Try to find the exact node for the given key */
-	for (node = rcu_dereference(trie->root); node;) {
+	for (node = search_root; node;) {
 		node_stack[++stack_ptr] = node;
 		matchlen = longest_prefix_match(trie, node, key);
 		if (node->prefixlen != matchlen ||
@@ -640,10 +638,8 @@ static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key)
 		node = rcu_dereference(node->child[next_bit]);
 	}
 	if (!node || node->prefixlen != key->prefixlen ||
-	    (node->flags & LPM_TREE_NODE_FLAG_IM)) {
-		root = &trie->root;
+	    (node->flags & LPM_TREE_NODE_FLAG_IM))
 		goto find_leftmost;
-	}
 
 	/* The node with the exactly-matching key has been found,
 	 * find the first node in postorder after the matched node.
@@ -651,10 +647,10 @@ static int trie_get_next_key(struct bpf_map *map, void *_key, void *_next_key)
 	node = node_stack[stack_ptr];
 	while (stack_ptr > 0) {
 		parent = node_stack[stack_ptr - 1];
-		if (rcu_dereference(parent->child[0]) == node &&
-		    rcu_dereference(parent->child[1])) {
-			root = &parent->child[1];
-			goto find_leftmost;
+		if (rcu_dereference(parent->child[0]) == node) {
+			search_root = rcu_dereference(parent->child[1]);
+			if (search_root)
+				goto find_leftmost;
 		}
 		if (!(parent->flags & LPM_TREE_NODE_FLAG_IM)) {
 			next_node = parent;
@@ -673,7 +669,7 @@ find_leftmost:
 	/* Find the leftmost non-intermediate node, all intermediate nodes
 	 * have exact two children, so this function will never return NULL.
 	 */
-	for (node = rcu_dereference(*root); node;) {
+	for (node = search_root; node;) {
 		if (!(node->flags & LPM_TREE_NODE_FLAG_IM))
 			next_node = node;
 		node = rcu_dereference(node->child[0]);