linux-kernel - [PATCH -next 0/3] nbd: fix null-ptr-dereference while accessing 'nbd->config'

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Date:   Fri,  7 Jul 2023 11:15:33 +0800
From:   Zhong Jinghua <zhongjinghua@...weicloud.com>
To:     josef@...icpanda.com, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, nbd@...er.debian.org,
        linux-kernel@...r.kernel.org, zhongjinghua@...weicloud.com,
        yi.zhang@...wei.com, yukuai3@...wei.com
Subject: [PATCH -next 0/3] nbd: fix null-ptr-dereference while accessing 'nbd->config'

From: Zhong Jinghua <zhongjinghua@...wei.com>

nbd->config = config and refcount_set(&nbd->config_refs, 1) in
nbd_genl_connect may be out of order, causing config_refs to be set to 1
first, and then nbd_open accessing nbd->config reports a null pointer
reference.

Zhong Jinghua (3):
  nbd: fold nbd config initialization into nbd_alloc_config()
  nbd: factor out a helper to get nbd_config without holding
    'config_lock'
  nbd: fix null-ptr-dereference while accessing 'nbd->config'

 drivers/block/nbd.c | 82 +++++++++++++++++++++++++++++----------------
 1 file changed, 53 insertions(+), 29 deletions(-)

-- 
2.31.1