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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jia-Ju Bai <baijiaju1990@gmail.com>,
	"David S . Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 33/68] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed()
Date: Tue, 13 Aug 2019 22:15:11 -0400
Message-ID: <20190814021548.16001-33-sashal@kernel.org> (raw)
In-Reply-To: <20190814021548.16001-1-sashal@kernel.org>

From: Jia-Ju Bai <baijiaju1990@gmail.com>

[ Upstream commit 271da132e29b5341c31eca6ba6a72ea1302ebac8 ]

In phy_led_trigger_change_speed(), there is an if statement on line 48
to check whether phy->last_triggered is NULL:
    if (!phy->last_triggered)

When phy->last_triggered is NULL, it is used on line 52:
    led_trigger_event(&phy->last_triggered->trigger, LED_OFF);

Thus, a possible null-pointer dereference may occur.

To fix this bug, led_trigger_event(&phy->last_triggered->trigger,
LED_OFF) is called when phy->last_triggered is not NULL.

This bug is found by a static analysis tool STCheck written by
the OSLAB group in Tsinghua University.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/phy/phy_led_triggers.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy_led_triggers.c b/drivers/net/phy/phy_led_triggers.c
index 491efc1bf5c48..7278eca70f9f3 100644
--- a/drivers/net/phy/phy_led_triggers.c
+++ b/drivers/net/phy/phy_led_triggers.c
@@ -58,8 +58,9 @@ void phy_led_trigger_change_speed(struct phy_device *phy)
 		if (!phy->last_triggered)
 			led_trigger_event(&phy->led_link_trigger->trigger,
 					  LED_FULL);
+		else
+			led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
 
-		led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
 		led_trigger_event(&plt->trigger, LED_FULL);
 		phy->last_triggered = plt;
 	}
-- 
2.20.1


  parent reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190814021548.16001-1-sashal@kernel.org>
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 06/68] netfilter: ebtables: fix a memory leak bug in compat Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 08/68] selftests/bpf: fix sendmsg6_prog on s390 Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 09/68] bonding: Force slave speed check after link state recovery for 802.3ad Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 10/68] net: mvpp2: Don't check for 3 consecutive Idle frames for 10G links Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 11/68] selftests: forwarding: gre_multipath: Enable IPv4 forwarding Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 12/68] selftests: forwarding: gre_multipath: Fix flower filters Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 13/68] can: dev: call netif_carrier_off() in register_candev() Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 14/68] can: mcp251x: add error check when wq alloc failed Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 15/68] can: gw: Fix error path of cgw_module_init Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 17/68] st21nfca_connectivity_event_received: null check the allocation Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 18/68] st_nci_hci_connectivity_event_received: " Sasha Levin
2019-08-14  2:14 ` [PATCH AUTOSEL 4.19 21/68] net: usb: qmi_wwan: Add the BroadMobi BM818 card Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 22/68] qed: RDMA - Fix the hw_ver returned in device attributes Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 23/68] isdn: mISDN: hfcsusb: Fix possible null-pointer dereferences in start_isoc_chain() Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 24/68] mac80211_hwsim: Fix possible null-pointer dereferences in hwsim_dump_radio_nl() Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 25/68] netfilter: ipset: Actually allow destination MAC address for hash:ip,mac sets too Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 26/68] netfilter: ipset: Copy the right MAC address in bitmap:ip,mac and hash:ip,mac sets Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 27/68] netfilter: ipset: Fix rename concurrency with listing Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 28/68] netfilter: ebtables: also count base chain policies Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 29/68] rxrpc: Fix potential deadlock Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 30/68] rxrpc: Fix the lack of notification when sendmsg() fails on a DATA packet Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 32/68] isdn: hfcsusb: Fix mISDN driver crash caused by transfer buffer on the stack Sasha Levin
2019-08-14  2:15 ` Sasha Levin [this message]
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 36/68] net: usb: pegasus: fix improper read if get_registers() fail Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 37/68] can: sja1000: force the string buffer NULL-terminated Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 38/68] can: peak_usb: " Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 39/68] net/ethernet/qlogic/qed: " Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 52/68] net: cxgb3_main: Fix a resource leak in a error path in 'init_one()' Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 53/68] net: stmmac: Fix issues when number of Queues >= 4 Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 54/68] net: stmmac: tc: Do not return a fragment entry Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 55/68] net: hisilicon: make hip04_tx_reclaim non-reentrant Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 56/68] net: hisilicon: fix hip04-xmit never return TX_BUSY Sasha Levin
2019-08-14  2:15 ` [PATCH AUTOSEL 4.19 57/68] net: hisilicon: Fix dma_map_single failed on arm64 Sasha Levin

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