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From: Zheng Yejian <zhengyejian1@huawei.com>
To: <gregkh@linuxfoundation.org>, <lee.jones@linaro.org>,
	<stable@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <tglx@linutronix.de>, <cj.chengjian@huawei.com>,
	<judy.chenhui@huawei.com>, <zhangjinhao2@huawei.com>
Subject: [PATCH 4.9.y 0/1] Bugfix for 781691c797de ("futex: Avoid violating the 10th rule of futex")
Date: Tue, 23 Feb 2021 22:41:50 +0800
Message-ID: <20210223144151.916675-1-zhengyejian1@huawei.com> (raw)

This patch may fix the following bug:

Link:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/?h=linux-4.9.y&id=5b1d078507bd33ebf6c2083fa363cf5832809c19

    > static int __fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
    > 				  struct task_struct *argowner)
    > {
    > 	struct futex_pi_state *pi_state = q->pi_state;
    > 	struct task_struct *oldowner, *newowner;
    > 	u32 uval, curval, newval, newtid;
    > 	int err = 0;
    > 
    > 	oldowner = pi_state->owner;
    > 
    > 	/* Owner died? */
    > 	if (!pi_state->owner)
    > 		newtid |= FUTEX_OWNER_DIED;
Variable "newtid" is used without initialized.

Peter Zijlstra (1):
  futex: Fix OWNER_DEAD fixup

 kernel/futex.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.25.4


             reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 14:41 Zheng Yejian [this message]
2021-02-23 14:41 ` [PATCH 4.9.y 1/1] futex: Fix OWNER_DEAD fixup Zheng Yejian
2021-02-24 11:19   ` Lee Jones
2021-02-25  6:29     ` Zhengyejian (Zetta)
2021-02-25  8:09       ` Lee Jones
2021-02-25  8:50         ` Zhengyejian (Zetta)
2021-03-01 14:15   ` Greg KH

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