From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Tue, 4 Feb 2020 11:10:12 -0800
Subject: net_sched: fix a resource leak in tcindex_set_parms()
Git-commit: 52b5ae501c045010aeeb1d5ac0373ff161a88291
Patch-mainline: 5.6-rc1
References: networking-stable-20_02_09

Jakub noticed there is a potential resource leak in
tcindex_set_parms(): when tcindex_filter_result_init() fails
and it jumps to 'errout1' which doesn't release the memory
and resources allocated by tcindex_alloc_perfect_hash().

We should just jump to 'errout_alloc' which calls
tcindex_free_perfect_hash().

Fixes: b9a24bb76bf6 ("net_sched: properly handle failure case of tcf_exts_init()")
Reported-by: Jakub Kicinski <kuba@kernel.org>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/sched/cls_tcindex.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -337,7 +337,7 @@ tcindex_set_parms(struct net *net, struc
 
 	err = tcindex_filter_result_init(&new_filter_result);
 	if (err < 0)
-		goto errout1;
+		goto errout_alloc;
 	if (old_r)
 		cr = r->res;
 
@@ -456,7 +456,6 @@ errout_alloc:
 		tcindex_free_perfect_hash(cp);
 	else if (balloc == 2)
 		kfree(cp->h);
-errout1:
 	tcf_exts_destroy(&new_filter_result.exts);
 errout:
 	kfree(cp);