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netfilter: nf_tables: add rescheduling points during loop detection walks

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[ Upstream commit 81ea010667417ef3f218dfd99b69769fe66c2b67 ]

Add explicit rescheduling points during ruleset walk.

Switching to a faster algorithm is possible but this is a much
smaller change, suitable for nf tree.

Link: https://bugzilla.netfilter.org/show_bug.cgi?id=1460
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Florian Westphal 2022-07-26 12:44:35 +02:00 committed by Greg Kroah-Hartman
parent a022c339af
commit de2efb42d6
1 changed files with 6 additions and 0 deletions
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6
net/netfilter/nf_tables_api.c
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@ -3442,6 +3442,8 @@ int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
if (err < 0)
return err;
}
cond_resched();
}
return 0;
@ -10041,9 +10043,13 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
break;
}
}
cond_resched();
}
list_for_each_entry(set, &ctx->table->sets, list) {
cond_resched();
if (!nft_is_active_next(ctx->net, set))
continue;
if (!(set->flags & NFT_SET_MAP) ||