netdev - [PATCH AUTOSEL 4.19 15/42] allocate_flower_entry: should check for null deref

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Message-Id: <20190802132302.13537-15-sashal@kernel.org>
Date:   Fri,  2 Aug 2019 09:22:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Navid Emamdoost <navid.emamdoost@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 15/42] allocate_flower_entry: should check for null deref

From: Navid Emamdoost <navid.emamdoost@...il.com>

[ Upstream commit bb1320834b8a80c6ac2697ab418d066981ea08ba ]

allocate_flower_entry does not check for allocation success, but tries
to deref the result. I only moved the spin_lock under null check, because
 the caller is checking allocation's status at line 652.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
index f2aba5b160c2d..d45c435a599d6 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
@@ -67,7 +67,8 @@ static struct ch_tc_pedit_fields pedits[] = {
 static struct ch_tc_flower_entry *allocate_flower_entry(void)
 {
 	struct ch_tc_flower_entry *new = kzalloc(sizeof(*new), GFP_KERNEL);
-	spin_lock_init(&new->lock);
+	if (new)
+		spin_lock_init(&new->lock);
 	return new;
 }
 
-- 
2.20.1