netfilter: nf_tables: fix chain filter in nf_tables_dump_rules()

[ Upstream commit 24c0df82ef7919e4d10cf2e4e65d368eb2e8ea21 ]

ctx->chain may be null now that we have very large object names,
so we cannot check for ctx->chain[0] here.

Fixes: b7263e071aba7 ("netfilter: nf_tables: Allow table names of up to 255 chars")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 64e1ee09122582bce81a4ee996064763083bcfa0..ce49946f755e0b8e4f1f0d6d1dd76b0cf9e50b3f 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2072,7 +2072,7 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
                                continue;
 
                        list_for_each_entry_rcu(chain, &table->chains, list) {
-                               if (ctx && ctx->chain[0] &&
+                               if (ctx && ctx->chain &&
                                    strcmp(ctx->chain, chain->name) != 0)
                                        continue;