linux-kernel - Re: [PATCH 2/4] PCI: pciehp: bail out if pci_hp_add

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Sat, 4 May 2024 17:02:34 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Nam Cao <namcao@...utronix.de>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Yinghai Lu <yinghai@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rajesh Shah <rajesh.shah@...el.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/4] PCI: pciehp: bail out if pci_hp_add_bridge() fails

On Sat, May 04, 2024 at 12:56:30PM +0200, Nam Cao wrote:
> On Sat, May 04, 2024 at 11:51:54AM +0200, Lukas Wunner wrote:
> > Could you reproduce with pciehp instead of shpchp please?
> 
> Same thing for pciehp below. I think the problem is because without 
> pci_stop_and_remove_bus_device(), no one cleans up the device added in
> pci_scan_slot(). When another device get hot-added, pci_get_slot() wrongly
> thinks another device is already there, so the hot-plug fails.

pciehp powers down the slot because you're returning a negative errno
from pciehp_configure_device().  Please return 0 instead if
pci_hp_add_bridge() fails.

Thanks,

Lukas