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From: Jerry Snitselaar <jsnitsel@redhat.com>
To: iommu@lists.linux-foundation.org
Cc: David Woodhouse <dwmw2@infradead.org>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH] iommu/vt-d: call __dmar_remove_one_dev_info with valid pointer
Date: Tue, 21 Jan 2020 17:34:26 -0700	[thread overview]
Message-ID: <20200122003426.16079-1-jsnitsel@redhat.com> (raw)

It is possible for archdata.iommu to be set to
DEFER_DEVICE_DOMAIN_INFO or DUMMY_DEVICE_DOMAIN_INFO so check for
those values before calling __dmar_remove_one_dev_info. Without a
check it can result in a null pointer dereference. This has been seen
while booting a kdump kernel on an HP dl380 gen9.

Cc: Joerg Roedel <joro@8bytes.org>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: stable@vger.kernel.org # 5.3+
Cc: linux-kernel@vger.kernel.org
Fixes: ae23bfb68f28 ("iommu/vt-d: Detach domain before using a private one")
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
---
 drivers/iommu/intel-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 1801f0aaf013..932267f49f9a 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5163,7 +5163,8 @@ static void dmar_remove_one_dev_info(struct device *dev)
 
 	spin_lock_irqsave(&device_domain_lock, flags);
 	info = dev->archdata.iommu;
-	if (info)
+	if (info && info != DEFER_DEVICE_DOMAIN_INFO
+	    && info != DUMMY_DEVICE_DOMAIN_INFO)
 		__dmar_remove_one_dev_info(info);
 	spin_unlock_irqrestore(&device_domain_lock, flags);
 }
-- 
2.24.0

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             reply	other threads:[~2020-01-22  0:35 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-22  0:34 Jerry Snitselaar [this message]
2020-01-22  5:43 ` [PATCH] iommu/vt-d: call __dmar_remove_one_dev_info with valid pointer Lu Baolu

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