From: Joerg Roedel <joro@8bytes.org>
To: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org, Joerg Roedel <jroedel@suse.de>,
stable@vger.kernel.org
Subject: [PATCH] iommu: Check dev->iommu in dev_iommu_priv_get() before dereferencing it
Date: Tue, 2 Feb 2021 15:54:19 +0100 [thread overview]
Message-ID: <20210202145419.29143-1-joro@8bytes.org> (raw)
From: Joerg Roedel <jroedel@suse.de>
The dev_iommu_priv_get() needs a similar check to
dev_iommu_fwspec_get() to make sure no NULL-ptr is dereferenced.
Fixes: 05a0542b456e1 ("iommu/amd: Store dev_data as device iommu private data")
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=211241
Cc: stable@vger.kernel.org # v5.8+
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
include/linux/iommu.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 524ffc2ff64f..5b3a7a08dc70 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -616,7 +616,10 @@ static inline void dev_iommu_fwspec_set(struct device *dev,
static inline void *dev_iommu_priv_get(struct device *dev)
{
- return dev->iommu->priv;
+ if (dev->iommu)
+ return dev->iommu->priv;
+ else
+ return NULL;
}
static inline void dev_iommu_priv_set(struct device *dev, void *priv)
--
2.30.0
reply other threads:[~2021-02-02 14:56 UTC|newest]
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