6.12-stable review patch. If anyone has any objections, please let me know.
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From: Hou Tao houtao1@huawei.com
[ Upstream commit 3d5611b4d7efbefb85a74fcdbc35c603847cc022 ]
There is no need to call kfree(im_node) when updating element fails, because im_node must be NULL. Remove the unnecessary kfree() for im_node.
Reviewed-by: Toke Høiland-Jørgensen toke@redhat.com Acked-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Hou Tao houtao1@huawei.com Link: https://lore.kernel.org/r/20241206110622.1161752-3-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov ast@kernel.org Stable-dep-of: 532d6b36b2bf ("bpf: Handle in-place update for full LPM trie correctly") Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/bpf/lpm_trie.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c index a82cf3693778a..8a040f123e04a 100644 --- a/kernel/bpf/lpm_trie.c +++ b/kernel/bpf/lpm_trie.c @@ -315,7 +315,7 @@ static long trie_update_elem(struct bpf_map *map, void *_key, void *value, u64 flags) { struct lpm_trie *trie = container_of(map, struct lpm_trie, map); - struct lpm_trie_node *node, *im_node = NULL, *new_node = NULL; + struct lpm_trie_node *node, *im_node, *new_node = NULL; struct lpm_trie_node *free_node = NULL; struct lpm_trie_node __rcu **slot; struct bpf_lpm_trie_key_u8 *key = _key; @@ -449,9 +449,7 @@ static long trie_update_elem(struct bpf_map *map, if (ret) { if (new_node) trie->n_entries--; - kfree(new_node); - kfree(im_node); }
spin_unlock_irqrestore(&trie->lock, irq_flags);