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bpf: fix possible endless loop in BPF map iteration

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[ Upstream commit 75673fda0c ]

The _safe variant used here gets the next element before running the callback,
avoiding the endless loop condition.

Signed-off-by: Brandon Kammerdiener <brandon.kammerdiener@intel.com>
Link: https://lore.kernel.org/r/20250424153246.141677-2-brandon.kammerdiener@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Brandon Kammerdiener 2025-04-24 11:32:51 -04:00 committed by Greg Kroah-Hartman
parent 218c838d03
commit 8014d3e56e
1 changed files with 1 additions and 1 deletions
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kernel/bpf/hashtab.c
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@ -2223,7 +2223,7 @@ static long bpf_for_each_hash_elem(struct bpf_map *map, bpf_callback_t callback_
b = &htab->buckets[i];
rcu_read_lock();
head = &b->head;
hlist_nulls_for_each_entry_rcu(elem, n, head, hash_node) {
hlist_nulls_for_each_entry_safe(elem, n, head, hash_node) {
key = elem->key;
if (is_percpu) {
/* current cpu value for percpu map */