linux-kernel - Re: [PATCH v?] iommu/riscv: check pte null pointer before use

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Message-ID: <effb29be-6d14-47e5-ab71-454119467750@web.de>
Date: Thu, 7 Aug 2025 09:22:45 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: XianLiang Huang <huangxianliang@...xincomputing.com>,
 iommu@...ts.linux.dev, linux-riscv@...ts.infradead.org,
 Tomasz Jeznach <tjeznach@...osinc.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>, Jörg Rödel
 <joro@...tes.org>, Palmer Dabbelt <palmer@...belt.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Robin Murphy
 <robin.murphy@....com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v?] iommu/riscv: check pte null pointer before use

…> Check the pointer before using it to avoid the bug. …

Would a summary phrase like “Prevent null pointer dereference in riscv_iommu_iova_to_phys()”
be also helpful?

Regards,
Markus