linux-kernel - [PATCH] iommu/iova: validate iova_domain input to put_iova

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Date:	Wed, 13 Jul 2016 14:49:32 -0400
From:	Nate Watterson <nwatters@...eaurora.org>
To:	robin.murphy@....com, Joerg Roedel <joro@...tes.org>,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc:	Nate Watterson <nwatters@...eaurora.org>
Subject: [PATCH] iommu/iova: validate iova_domain input to put_iova_domain

Passing a NULL or uninitialized iova_domain into put_iova_domain
will currently crash the kernel when the unconfigured iova_domain
data members are accessed. To prevent this from occurring, this patch
adds a check to make sure that the domain is non-NULL and that the
domain granule is non-zero. The granule can be used to check if the
domain was properly initialized because calling init_iova_domain
with a granule of zero would have already triggered a BUG statement
crashing the kernel.

Signed-off-by: Nate Watterson <nwatters@...eaurora.org>
---
 drivers/iommu/iova.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index e23001b..3511a1c 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -459,6 +459,10 @@ void put_iova_domain(struct iova_domain *iovad)
 	struct rb_node *node;
 	unsigned long flags;

+	/* Only teardown properly initialized domains */
+	if (!iovad || !iovad->granule)
+		return;
+
 	free_iova_rcaches(iovad);
 	spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
 	node = rb_first(&iovad->rbroot);
-- 
Qualcomm Datacenter Technologies, Inc. on behalf of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
Foundation Collaborative Project.