netfilter: nf_tables: fix overrun in nf_tables_set_alloc_name()

The map that is used to allocate anonymous sets is indeed
BITS_PER_BYTE * PAGE_SIZE long.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 9ce30534f853..2a22a186eb3d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1989,13 +1989,13 @@ static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
 
                         if (!sscanf(i->name, name, &tmp))
                                 continue;
-                        if (tmp < 0 || tmp > BITS_PER_LONG * PAGE_SIZE)
+                        if (tmp < 0 || tmp >= BITS_PER_BYTE * PAGE_SIZE)
                                 continue;
 
                         set_bit(tmp, inuse);
                 }
 
-                n = find_first_zero_bit(inuse, BITS_PER_LONG * PAGE_SIZE);
+                n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
                 free_page((unsigned long)inuse);
         }