linux-kernel - [PATCH V2 2/2] include: linux: Update gather only if it's not NULL

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: <20240801033432.106837-2-amhetre@nvidia.com>
Date: Thu, 1 Aug 2024 03:34:32 +0000
From: Ashish Mhetre <amhetre@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>, Ashish Mhetre
	<amhetre@...dia.com>
Subject: [PATCH V2 2/2] include: linux: Update gather only if it's not NULL

Gather can be NULL when unmap is called for freeing old table while
mapping. If it's NULL then there is no need to add page for syncing
the TLB.

Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
---
 include/linux/iommu.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 4d47f2c33311..2a28c1ef8517 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -928,6 +928,9 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
 					       struct iommu_iotlb_gather *gather,
 					       unsigned long iova, size_t size)
 {
+	if (!gather)
+		return;
+
 	/*
 	 * If the new page is disjoint from the current range or is mapped at
 	 * a different granularity, then sync the TLB so that the gather
-- 
2.25.1