| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.19 065/365] bpf: Acquire map uref in .init_seq_private for hash map iterator | Date | Tue, 23 Aug 2022 09:59:26 +0200 |
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From: Hou Tao <houtao1@huawei.com>
commit ef1e93d2eeb58a1f08c37b22a2314b94bc045f15 upstream.
bpf_iter_attach_map() acquires a map uref, and the uref may be released before or in the middle of iterating map elements. For example, the uref could be released in bpf_iter_detach_map() as part of bpf_link_release(), or could be released in bpf_map_put_with_uref() as part of bpf_map_release().
So acquiring an extra map uref in bpf_iter_init_hash_map() and releasing it in bpf_iter_fini_hash_map().
Fixes: d6c4503cc296 ("bpf: Implement bpf iterator for hash maps") Signed-off-by: Hou Tao <houtao1@huawei.com> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/r/20220810080538.1845898-3-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- kernel/bpf/hashtab.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/kernel/bpf/hashtab.c +++ b/kernel/bpf/hashtab.c @@ -2060,6 +2060,7 @@ static int bpf_iter_init_hash_map(void * seq_info->percpu_value_buf = value_buf; } + bpf_map_inc_with_uref(map); seq_info->map = map; seq_info->htab = container_of(map, struct bpf_htab, map); return 0; @@ -2069,6 +2070,7 @@ static void bpf_iter_fini_hash_map(void { struct bpf_iter_seq_hash_map_info *seq_info = priv_data; + bpf_map_put_with_uref(seq_info->map); kfree(seq_info->percpu_value_buf); }
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