The conversion looks harmless, however the addr value is updated inside the loop with the previous vm_end, which then incorrectly leads to for_each_vma_range() iterating over stuff outside the range we care about. Fix this by storing the end value separately.
Testcase: igt@gem_userptr_blits@probe Fixes: f683b9d61319 ("i915: use the VMA iterator") Reported-by: kernel test robot <oliver.s...@intel.com> Signed-off-by: Matthew Auld <matthew.a...@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com> Cc: Matthew Wilcox (Oracle) <wi...@infradead.org> Cc: Vlastimil Babka <vba...@suse.cz> Cc: Yu Zhao <yuz...@google.com> --- drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c index b7e24476a0fd..dadb3e3fa9c8 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c @@ -427,9 +427,10 @@ probe_range(struct mm_struct *mm, unsigned long addr, unsigned long len) { VMA_ITERATOR(vmi, mm, addr); struct vm_area_struct *vma; + unsigned long end = addr + len; mmap_read_lock(mm); - for_each_vma_range(vmi, vma, addr + len) { + for_each_vma_range(vmi, vma, end) { /* Check for holes, note that we also update the addr below */ if (vma->vm_start > addr) break; -- 2.37.3