netdev - [PATCH] net: dsa: felix: fix possible NULL pointer dereference

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Message-ID: <20220329081214.124061-1-zhengyongjun3@huawei.com>
Date:   Tue, 29 Mar 2022 08:12:14 +0000
From:   Zheng Yongjun <zhengyongjun3@...wei.com>
To:     <andrew@...n.ch>, <vivien.didelot@...il.com>,
        <f.fainelli@...il.com>, <davem@...emloft.net>, <kuba@...nel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <vladimir.oltean@....com>, <claudiu.manoil@....com>,
        <alexandre.belloni@...tlin.com>, <UNGLinuxDriver@...rochip.com>
Subject: [PATCH] net: dsa: felix: fix possible NULL pointer dereference

As the possible failure of the allocation, kzalloc() may return NULL
pointer.
Therefore, it should be better to check the 'sgi' in order to prevent
the dereference of NULL pointer.

Fixes: 23ae3a7877718 ("net: dsa: felix: add stream gate settings for psfpq").
Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>
---
 drivers/net/dsa/ocelot/felix_vsc9959.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 33f0ceae381d..2875b5250856 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1940,6 +1940,10 @@ static int vsc9959_psfp_filter_add(struct ocelot *ocelot, int port,
 		case FLOW_ACTION_GATE:
 			size = struct_size(sgi, entries, a->gate.num_entries);
 			sgi = kzalloc(size, GFP_KERNEL);
+			if (!sgi) {
+				ret = -ENOMEM;
+				goto err;
+			}
 			vsc9959_psfp_parse_gate(a, sgi);
 			ret = vsc9959_psfp_sgi_table_add(ocelot, sgi);
 			if (ret) {
-- 
2.17.1