netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: David Miller <davem@davemloft.net>
To: baijiaju1990@gmail.com
Cc: andrew@lunn.ch, f.fainelli@gmail.com, hkallweit1@gmail.com,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed()
Date: Wed, 31 Jul 2019 18:57:05 -0400 (EDT)	[thread overview]
Message-ID: <20190731.185705.323737673654483593.davem@davemloft.net> (raw)
In-Reply-To: <20190730080813.15363-1-baijiaju1990@gmail.com>

From: Jia-Ju Bai <baijiaju1990@gmail.com>
Date: Tue, 30 Jul 2019 16:08:13 +0800

> 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>

Applied, thanks.

      reply	other threads:[~2019-07-31 22:57 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-30  8:08 [PATCH v2] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed() Jia-Ju Bai
2019-07-31 22:57 ` David Miller [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190731.185705.323737673654483593.davem@davemloft.net \
    --to=davem@davemloft.net \
    --cc=andrew@lunn.ch \
    --cc=baijiaju1990@gmail.com \
    --cc=f.fainelli@gmail.com \
    --cc=hkallweit1@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).