Re: [PATCH bpf v2 3/9] bpf: Acquire map uref in .init_seq_private for sock local storage map iterator

[Martin KaFai Lau <kafai@xxxxxx>]

On Wed, Aug 10, 2022 at 04:05:32PM +0800, Hou Tao wrote:
> From: Hou Tao <houtao1@xxxxxxxxxx>
> 
> 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().
Acked-by: Martin KaFai Lau <kafai@xxxxxx>