linux-kernel - [PATCH 4.9.257 0/1] Bugfix for 781691c797de ("futex: Avoid violating the 10th rule of futex")

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Message-ID: <20210222110542.3531596-1-zhengyejian1@huawei.com>
Date:   Mon, 22 Feb 2021 19:05:41 +0800
From:   Zheng Yejian <zhengyejian1@...wei.com>
To:     <gregkh@...uxfoundation.org>, <stable@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <judy.chenhui@...wei.com>, <zhangjinhao2@...wei.com>,
        <lee.jones@...aro.org>, <tglx@...utronix.de>
Subject: [PATCH 4.9.257 0/1] Bugfix for 781691c797de ("futex: Avoid violating the 10th rule of futex")

This patch may fix the following bug:

Link:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/kernel/futex.c?h=linux-4.9.y&id=282aeb477a10d09cc5c4d73c54bb996964723f96

    > 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 | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

-- 
2.25.4