Commits
Jiang Liu committed cc4f14aa170
iommu/vt-d: Fix an off-by-one bug in __domain_mapping() There's an off-by-one bug in function __domain_mapping(), which may trigger the BUG_ON(nr_pages < lvl_pages) when (nr_pages + 1) & superpage_mask == 0 The issue was introduced by commit 9051aa0268dc "intel-iommu: Combine domain_pfn_mapping() and domain_sg_mapping()", which sets sg_res to "nr_pages + 1" to avoid some of the 'sg_res==0' code paths. It's safe to remove extra "+1" because sg_res is only used to calculate page size now. Reported-And-Tested-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: <stable@vger.kernel.org> # >= 3.0 Acked-By: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>