From f601927136d69be49f0a14ae820b44c02fa591ba Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Fri, 16 Jun 2017 16:09:58 +0200 Subject: [PATCH] iommu/amd: Set global pointers to NULL after freeing them Avoid any tries to double-free these pointers. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu_init.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index a6b81a05a0d1..8cc507f96f3a 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2114,18 +2114,22 @@ static void __init free_iommu_resources(void) kmemleak_free(irq_lookup_table); free_pages((unsigned long)irq_lookup_table, get_order(rlookup_table_size)); + irq_lookup_table = NULL; kmem_cache_destroy(amd_iommu_irq_cache); amd_iommu_irq_cache = NULL; free_pages((unsigned long)amd_iommu_rlookup_table, get_order(rlookup_table_size)); + amd_iommu_rlookup_table = NULL; free_pages((unsigned long)amd_iommu_alias_table, get_order(alias_table_size)); + amd_iommu_alias_table = NULL; free_pages((unsigned long)amd_iommu_dev_table, get_order(dev_table_size)); + amd_iommu_dev_table = NULL; free_iommu_all(); @@ -2195,6 +2199,7 @@ static void __init free_dma_resources(void) { free_pages((unsigned long)amd_iommu_pd_alloc_bitmap, get_order(MAX_DOMAIN_ID/8)); + amd_iommu_pd_alloc_bitmap = NULL; free_unity_maps(); } -- 2.20.1