334-v4.15-netfilter-nf_tables-fix-potential-NULL-ptr-deref-in-.patch

From: Hangbin Liu <liuhangbin@gmail.com>
Date: Mon, 25 Dec 2017 11:34:54 +0800
Subject: [PATCH] netfilter: nf_tables: fix potential NULL-ptr deref in
 nf_tables_dump_obj_done()

If there is no NFTA_OBJ_TABLE and NFTA_OBJ_TYPE, the c.data will be NULL in
nf_tables_getobj(). So before free filter->table in nf_tables_dump_obj_done(),
we need to check if filter is NULL first.

Fixes: e46abbcc05aa ("netfilter: nf_tables: Allow table names of up to 255 chars")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5357,8 +5357,10 @@ static int nf_tables_dump_flowtable_done
 	if (!filter)
 		return 0;
 
-	kfree(filter->table);
-	kfree(filter);
+	if (filter) {
+		kfree(filter->table);
+		kfree(filter);
+	}
 
 	return 0;
 }