From: Lukas Wunner <lukas@wunner.de>
To: Kangfenglong <kangfenglong@huawei.com>
Cc: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"shenyang (M)" <shenyang39@huawei.com>,
"Zengtao (B)" <prime.zeng@hisilicon.com>,
"shenjian (K)" <shenjian15@huawei.com>,
"Wangyu (Eric)" <seven.wangyu@huawei.com>
Subject: Re: [BUG] PCI/DPC: NULL pointer dereference in pci_bus_read_config_dword during DPC recovery racing with hotplug
Date: Wed, 14 Jan 2026 11:18:38 +0100 [thread overview]
Message-ID: <aWdtfj2ubHp41fRT@wunner.de> (raw)
In-Reply-To: <fe8a89b501e44737821fe8b0ab4492e9@huawei.com>
On Wed, Jan 14, 2026 at 09:49:44AM +0000, Kangfenglong wrote:
> Kernel Version: 5.10.0
That's ancient.
The bug you're seeing was fixed upstream with 11a1f4bc4736 ("PCI/DPC:
Fix use-after-free on concurrent DPC and hot-removal"). It was
backported to 5.10.224.
> 1. Existing synchronization between DPC and hotplug?
That was introduced by a97396c6eb13 ("PCI: pciehp: Ignore Link Down/Up
caused by DPC"), which went into v5.14.
Thanks,
Lukas
prev parent reply other threads:[~2026-01-14 10:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-14 9:49 [BUG] PCI/DPC: NULL pointer dereference in pci_bus_read_config_dword during DPC recovery racing with hotplug Kangfenglong
2026-01-14 10:18 ` Lukas Wunner [this message]
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