linux-kernel - [PATCH] sch_gred: kzalloc needs null check

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Date:   Thu, 18 Jul 2019 20:30:26 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     emamd001@....edu, kjlu@....edu, smccaman@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] sch_gred: kzalloc needs null check

call to kzalloc may fail and return null. So the result should be checked
against null. Added the check to cover kzalloc failure case.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 net/sched/sch_gred.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index 8599c6f31b05..5cd0859f0274 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -697,6 +697,9 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt,
 	}
 
 	prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
+	if (!prealloc)
+		return -ENOMEM;
+
 	sch_tree_lock(sch);
 
 	err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc,
-- 
2.17.1