[nft 3/3] parser_bison: release parsed type and hook name strings

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

The scanner allocates memory for this, so release them given that we
don't attach them to any object.

==6277== 42 bytes in 6 blocks are definitely lost in loss record 2 of 4
==6277==    at 0x4C28C20: malloc (vg_replace_malloc.c:296)
==6277==    by 0x57AC9D9: strdup (strdup.c:42)
==6277==    by 0x41B82D: xstrdup (utils.c:64)
==6277==    by 0x41F510: nft_lex (scanner.l:511)
==6277==    by 0x427FD1: nft_parse (parser_bison.c:3690)
==6277==    by 0x4063AC: nft_run (main.c:231)
==6277==    by 0x40600C: main (main.c:361)

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/parser_bison.y | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/parser_bison.y b/src/parser_bison.y
index 0592b68..9e86f26 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -1107,12 +1107,16 @@ hook_spec		:	TYPE		STRING		HOOK		STRING		dev_spec	PRIORITY	prio_spec
 						   state->msgs);
 					YYERROR;
 				}
+				xfree($2);
+
 				$<chain>0->hookstr	= chain_hookname_lookup($4);
 				if ($<chain>0->hookstr == NULL) {
 					erec_queue(error(&@4, "unknown chain hook %s", $4),
 						   state->msgs);
 					YYERROR;
 				}
+				xfree($4);
+
 				$<chain>0->dev		= $5;
 				$<chain>0->priority	= $7;
 				$<chain>0->flags	|= CHAIN_F_BASECHAIN;
-- 
2.1.4