linux-kernel - Re: [PATCH] phy: qcom-qmp-usb: Fix an NULL vs IS

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]

Message-ID: <Z_y73a5IDO66AzY1@hovoldconsulting.com>
Date: Mon, 14 Apr 2025 09:40:13 +0200
From: Johan Hovold <johan@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Chenyuan Yang <chenyuan0y@...il.com>, vkoul@...nel.org,
	kishon@...nel.org, lumag@...nel.org, quic_kriskura@...cinc.com,
	manivannan.sadhasivam@...aro.org, konrad.dybcio@....qualcomm.com,
	quic_varada@...cinc.com, quic_kbajaj@...cinc.com,
	johan+linaro@...nel.org, linux-arm-msm@...r.kernel.org,
	linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug

On Mon, Apr 14, 2025 at 09:30:19AM +0200, Krzysztof Kozlowski wrote:
> On 13/04/2025 23:25, Chenyuan Yang wrote:
> > In qmp_usb_iomap(), one branch returns the result of devm_ioremap(), which
> > can be NULL. Since IS_ERR() does not catch a NULL pointer,
> 
> No, that's not true. NAK.

I'm afraid you're mistaken here. See __devm_ioremap() which can return
NULL.

Johan