linux-kernel - [PATCH v5 15/21] iommu/tegra: gart: Fix NULL pointer dereference

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Message-Id: <20180930224833.28809-16-digetx@gmail.com>
Date:   Mon,  1 Oct 2018 01:48:27 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 15/21] iommu/tegra: gart: Fix NULL pointer dereference

Fix NULL pointer dereference on IOMMU domain destruction that happens
because clients list is being iterated unsafely and its elements are
getting deleted during the iteration.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Acked-by: Thierry Reding <treding@...dia.com>
---
 drivers/iommu/tegra-gart.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index e6fe139576c3..1d45b023adea 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -258,9 +258,9 @@ static void gart_iommu_domain_free(struct iommu_domain *domain)
 	if (gart) {
 		spin_lock(&gart->client_lock);
 		if (!list_empty(&gart->client)) {
-			struct gart_client *c;
+			struct gart_client *c, *tmp;
 
-			list_for_each_entry(c, &gart->client, list)
+			list_for_each_entry_safe(c, tmp, &gart->client, list)
 				__gart_iommu_detach_dev(domain, c->dev);
 		}
 		spin_unlock(&gart->client_lock);
-- 
2.19.0