netfilter: nf_tables: fix chain filter in nf_tables_dump_rules()

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>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 10798b35748180746266aa0a84187dfd7f0f1ceb..8d4526651661566cf3d3042fbfcdbbd00847862b 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;