bpf, sockmap: Use sock_hold() instead of refcount_inc_not_zero() in lookup

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psock's hold on the looked up socket isn't dropped until sk_psock_drop() ->
queue_rcu_work() -> sk_psock_destroy() runs, which happens only after the
entry is unlinked and an RCU grace period elapses. Since the lookup runs
under RCU, a non-NULL result guarantees sk_refcnt >= 1:
refcount_inc_not_zero() can never fail here. Use sock_hold() instead.

Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/20260813-sockmap-lookup-get-ref-v1-2-31f5d55f44ac@rbox.co

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Michal Luczaj 2026-08-13 14:42:00 +02:00 • committed by Daniel Borkmann

parent 3c3d2c09ec

commit 34e0eb763b

1 changed files with 4 additions and 4 deletions

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net/core/sock_map.c

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