From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: andrew@lunn.ch, f.fainelli@gmail.com, hkallweit1@gmail.com,
davem@davemloft.net
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Jia-Ju Bai <baijiaju1990@gmail.com>
Subject: [PATCH] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed()
Date: Mon, 29 Jul 2019 17:24:24 +0800 [thread overview]
Message-ID: <20190729092424.30928-1-baijiaju1990@gmail.com> (raw)
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 us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
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 b86a4b2116f8..59a94e07e7c5 100644
--- a/drivers/net/phy/phy_led_triggers.c
+++ b/drivers/net/phy/phy_led_triggers.c
@@ -48,8 +48,9 @@ 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;
}
--
2.17.0
next reply other threads:[~2019-07-29 9:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 9:24 Jia-Ju Bai [this message]
2019-07-29 13:45 ` [PATCH] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed() Andrew Lunn
2019-07-30 2:25 ` Jia-Ju Bai
2019-07-30 3:32 ` Andrew Lunn
2019-07-30 3:41 ` David Miller
2019-07-30 8:03 ` Jia-Ju Bai
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