]> git.baikalelectronics.ru Git - kernel.git/commit
bpf: Acquire map uref in .init_seq_private for sock local storage map iterator
authorHou Tao <houtao1@huawei.com>
Wed, 10 Aug 2022 08:05:32 +0000 (16:05 +0800)
committerAlexei Starovoitov <ast@kernel.org>
Wed, 10 Aug 2022 17:12:48 +0000 (10:12 -0700)
commit869a1582e50d2dec51c338ad71ce8b02395e0307
tree266aa1abc3e616ba1911890060ae4a8fc4a1e320
parent25799705c386660271c34eb79fd718a67df390bf
bpf: Acquire map uref in .init_seq_private for sock local storage map iterator

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_sk_storage_map() and
releasing it in bpf_iter_fini_sk_storage_map().

Fixes: 8278de68a482 ("bpf: Implement bpf iterator for sock local storage map")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220810080538.1845898-4-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
net/core/bpf_sk_storage.c