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netfilter: nft_set_pipapo: allocate pcpu scratch maps on clone 

This is needed in case a new transaction is made that doesn't insert any
new elements into an already existing set.

Else, after second 'nft -f ruleset.txt', lookups in such a set will fail
because ->lookup() encounters raw_cpu_ptr(m->scratch) == NULL.

For the initial rule load, insertion of elements takes care of the
allocation, but for rule reloads this isn't guaranteed: we might not
have additions to the set.

Fixes: 3c4287f620 ("nf_tables: Add set type for arbitrary concatenation of ranges")
Reported-by: etkaar <lists.netfilter.org@prvy.eu>
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2022-01-05 14:19:54 +01:00 committed by Pablo Neira Ayuso
parent 4e1860a386
commit 23c54263ef
1 changed files with 8 additions and 0 deletions
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8
net/netfilter/nft_set_pipapo.c
View File

@ -1290,6 +1290,11 @@ static struct nft_pipapo_match *pipapo_clone(struct nft_pipapo_match *old)
if (!new->scratch_aligned)
goto out_scratch;
#endif
for_each_possible_cpu(i)
*per_cpu_ptr(new->scratch, i) = NULL;
if (pipapo_realloc_scratch(new, old->bsize_max))
goto out_scratch_realloc;
rcu_head_init(&new->rcu);
@ -1334,6 +1339,9 @@ out_lt:
kvfree(dst->lt);
dst--;
}
out_scratch_realloc:
for_each_possible_cpu(i)
kfree(*per_cpu_ptr(new->scratch, i));
#ifdef NFT_PIPAPO_ALIGN
free_percpu(new->scratch_aligned);
#endif