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.sang@xxxxxxxxx>
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
---
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
