netdev - [Patch net v2 3/3] net_sched: fix two more memory leaks in cls

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Message-Id: <20190211210616.9592-4-xiyou.wangcong@gmail.com>
Date:   Mon, 11 Feb 2019 13:06:16 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: [Patch net v2 3/3] net_sched: fix two more memory leaks in cls_tcindex

struct tcindex_filter_result contains two parts:
struct tcf_exts and struct tcf_result.

For the local variable 'cr', its exts part is never used but
initialized without being released properly on success path. So
just completely remove the exts part to fix this leak.

For the local variable 'new_filter_result', it is never properly
released if not used by 'r' on success path.

Cc: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Jiri Pirko <jiri@...nulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/sched/cls_tcindex.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 70ea5b1a7889..38bb882bb958 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -304,9 +304,9 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 		  struct nlattr *est, bool ovr, struct netlink_ext_ack *extack)
 {
 	struct tcindex_filter_result new_filter_result, *old_r = r;
-	struct tcindex_filter_result cr;
 	struct tcindex_data *cp = NULL, *oldp;
 	struct tcindex_filter *f = NULL; /* make gcc behave */
+	struct tcf_result cr = {};
 	int err, balloc = 0;
 	struct tcf_exts e;
 
@@ -345,13 +345,10 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 	cp->h = p->h;
 
 	err = tcindex_filter_result_init(&new_filter_result);
-	if (err < 0)
-		goto errout1;
-	err = tcindex_filter_result_init(&cr);
 	if (err < 0)
 		goto errout1;
 	if (old_r)
-		cr.res = r->res;
+		cr = r->res;
 
 	if (tb[TCA_TCINDEX_HASH])
 		cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
@@ -442,8 +439,8 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 	}
 
 	if (tb[TCA_TCINDEX_CLASSID]) {
-		cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
-		tcf_bind_filter(tp, &cr.res, base);
+		cr.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
+		tcf_bind_filter(tp, &cr, base);
 	}
 
 	if (old_r && old_r != r) {
@@ -455,7 +452,7 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 	}
 
 	oldp = p;
-	r->res = cr.res;
+	r->res = cr;
 	tcf_exts_change(&r->exts, &e);
 
 	rcu_assign_pointer(tp->root, cp);
@@ -474,6 +471,8 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 				; /* nothing */
 
 		rcu_assign_pointer(*fp, f);
+	} else {
+		tcf_exts_destroy(&new_filter_result.exts);
 	}
 
 	if (oldp)
@@ -486,7 +485,6 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 	else if (balloc == 2)
 		kfree(cp->h);
 errout1:
-	tcf_exts_destroy(&cr.exts);
 	tcf_exts_destroy(&new_filter_result.exts);
 errout:
 	kfree(cp);
-- 
2.20.1