bpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself

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[ Upstream commit 5b4a79ba65 ]

sock_map proto callbacks should never call themselves by design. Protect
against bugs like [1] and break out of the recursive loop to avoid a stack
overflow in favor of a resource leak.

[1] https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20230113-sockmap-fix-v2-1-1e0ee7ac2f90@cloudflare.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Jakub Sitnicki 2023-01-21 13:41:43 +01:00 • committed by Greg Kroah-Hartman

parent 22fcbb7802

commit 7499859881

1 changed files with 34 additions and 27 deletions

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net/core/sock_map.c

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