[nft 2/3] parser_bison: duplicate string returned by chain_type_name_lookup()

[Pablo Neira Ayuso <pablo@netfilter.org>]

This chain type string is released via chain_free() since b7cb6915a88f,
so duplicate it so we don't try to release statically allocated memory.

Fixes: b7cb6915a88f ("rule: Remove memory leak")
Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/parser_bison.y | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/parser_bison.y b/src/parser_bison.y
index 24c0969..0592b68 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -1101,7 +1101,7 @@ type_identifier		:	STRING	{ $$ = $1; }
 
 hook_spec		:	TYPE		STRING		HOOK		STRING		dev_spec	PRIORITY	prio_spec
 			{
-				$<chain>0->type		= chain_type_name_lookup($2);
+				$<chain>0->type		= xstrdup(chain_type_name_lookup($2));
 				if ($<chain>0->type == NULL) {
 					erec_queue(error(&@2, "unknown chain type %s", $2),
 						   state->msgs);
-- 
2.1.4