netfilter: nf_tables: bump set->ndeact on set flush

Add missing set->ndeact update on each deactivated element from the set
flush path. Otherwise, sets with fixed size break after flush since
accounting breaks.

 # nft add set x y { type ipv4_addr\; size 2\; }
 # nft add element x y { 1.1.1.1 }
 # nft add element x y { 1.1.1.2 }
 # nft flush set x y
 # nft add element x y { 1.1.1.1 }
 <cmdline>:1:1-28: Error: Could not process rule: Too many open files in system

Fixes: 8411b6442e59 ("netfilter: nf_tables: support for set flushing")
Reported-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 5bd0068320fb0996d18115fda02c27b68061fd5f..1b913760f205be79e1809c983cb3140c284a00cc 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3906,6 +3906,7 @@ static int nft_flush_set(const struct nft_ctx *ctx,
                err = -ENOENT;
                goto err1;
        }
+       set->ndeact++;
 
        nft_trans_elem_set(trans) = set;
        nft_trans_elem(trans) = *elem;