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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
	iommu@lists.linux-foundation.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH AUTOSEL 4.14 242/371] iommu/amd: Make iommu_disable safer
Date: Thu, 16 Jan 2020 12:21:54 -0500	[thread overview]
Message-ID: <20200116172403.18149-185-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>

From: Kevin Mitchell <kevmitch@arista.com>

[ Upstream commit 3ddbe913e55516d3e2165d43d4d5570761769878 ]

Make it safe to call iommu_disable during early init error conditions
before mmio_base is set, but after the struct amd_iommu has been added
to the amd_iommu_list. For example, this happens if firmware fails to
fill in mmio_phys in the ACPI table leading to a NULL pointer
dereference in iommu_feature_disable.

Fixes: 2c0ae1720c09c ('iommu/amd: Convert iommu initialization to state machine')
Signed-off-by: Kevin Mitchell <kevmitch@arista.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu_init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 6a3cf4d0bd5e..4d2920988d60 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -420,6 +420,9 @@ static void iommu_enable(struct amd_iommu *iommu)
 
 static void iommu_disable(struct amd_iommu *iommu)
 {
+	if (!iommu->mmio_base)
+		return;
+
 	/* Disable command buffer */
 	iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
 
-- 
2.20.1

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  parent reply	other threads:[~2020-01-16 17:28 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116172403.18149-1-sashal@kernel.org>
2020-01-16 17:20 ` [PATCH AUTOSEL 4.14 181/371] iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU Sasha Levin
2020-01-16 17:21 ` [PATCH AUTOSEL 4.14 218/371] iommu: Use right function to get group for device Sasha Levin
2020-01-16 17:21 ` [PATCH AUTOSEL 4.14 226/371] iommu/vt-d: Duplicate iommu_resv_region objects per device list Sasha Levin
2020-01-16 17:21 ` Sasha Levin [this message]
2020-01-16 17:22 ` [PATCH AUTOSEL 4.14 277/371] iommu/mediatek: Fix iova_to_phys PA start for 4GB mode Sasha Levin
2020-01-16 17:22 ` [PATCH AUTOSEL 4.14 302/371] iommu/amd: Wait for completion of IOTLB flush in attach_device Sasha Levin

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