From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
Dave Jiang <dave.jiang@intel.com>,
Ashok Raj <ashok.raj@intel.com>,
iommu@lists.linux-foundation.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH AUTOSEL 4.19 229/671] iommu/vt-d: Fix NULL pointer reference in intel_svm_bind_mm()
Date: Thu, 16 Jan 2020 11:52:18 -0500 [thread overview]
Message-ID: <20200116165940.10720-112-sashal@kernel.org> (raw)
In-Reply-To: <20200116165940.10720-1-sashal@kernel.org>
From: Lu Baolu <baolu.lu@linux.intel.com>
[ Upstream commit c56cba5daf45d2d091ef1cfe2f1d6a930446687b ]
Intel IOMMU could be turned off with intel_iommu=off. If Intel
IOMMU is off, the intel_iommu struct will not be initialized.
When device drivers call intel_svm_bind_mm(), the NULL pointer
reference will happen there.
Add dmar_disabled check to avoid NULL pointer reference.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reported-by: Dave Jiang <dave.jiang@intel.com>
Fixes: 2f26e0a9c9860 ("iommu/vt-d: Add basic SVM PASID support")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/intel-svm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 188f4eaed6e5..fd8730b2cd46 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -293,7 +293,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
int pasid_max;
int ret;
- if (!iommu)
+ if (!iommu || dmar_disabled)
return -EINVAL;
if (dev_is_pci(dev)) {
--
2.20.1
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prev parent reply other threads:[~2020-01-16 17:02 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116165940.10720-1-sashal@kernel.org>
2020-01-16 16:52 ` [PATCH AUTOSEL 4.19 219/671] iommu: Fix IOMMU debugfs fallout Sasha Levin
2020-01-16 16:52 ` Sasha Levin [this message]
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