From 8e924910dd07f1614fe534f8bdfdc17f7de3d68b Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Wed, 12 Dec 2018 23:39:01 +0300 Subject: [PATCH] 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 Acked-by: Thierry Reding Signed-off-by: Joerg Roedel --- 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 a7a9400e0cd8..7fdd8b12efd5 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -260,9 +260,9 @@ 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);