src: fix memory leaks at nft_[object]_nlmsg_parse

Free object attributes before overwrite it. Fix 'nlmsg_parse' methods of
following objects: 'table', 'chain', 'rule', 'set' and 'set_element'.

Signed-off-by: Carlos Falgueras García <carlosfg@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/rule.c b/src/rule.c
index 04088ed..ebaa3ed 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -425,10 +425,12 @@ int nft_rule_nlmsg_parse(const struct nlmsghdr *nlh, struct nft_rule *r)
 		return -1;
 
 	if (tb[NFTA_RULE_TABLE]) {
+		xfree(r->table);
 		r->table = strdup(mnl_attr_get_str(tb[NFTA_RULE_TABLE]));
 		r->flags |= (1 << NFT_RULE_ATTR_TABLE);
 	}
 	if (tb[NFTA_RULE_CHAIN]) {
+		xfree(r->chain);
 		r->chain = strdup(mnl_attr_get_str(tb[NFTA_RULE_CHAIN]));
 		r->flags |= (1 << NFT_RULE_ATTR_CHAIN);
 	}