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Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index eb37d1668770..33b642076205 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -1820,10 +1820,11 @@ static unsigned long remap_move(struct vma_remap_struct *vrm)
unsigned long start = vrm->addr;
unsigned long end = vrm->addr + vrm->old_len;
unsigned long new_addr = vrm->new_addr;
- bool allowed = true, seen_vma = false;
unsigned long target_addr = new_addr;
unsigned long res = -EFAULT;
unsigned long last_end;
+ bool seen_vma = false;
+
VMA_ITERATOR(vmi, current->mm, start);
/*
@@ -1836,9 +1837,7 @@ static unsigned long remap_move(struct vma_remap_struct *vrm)
unsigned long addr = max(vma->vm_start, start);
unsigned long len = min(end, vma->vm_end) - addr;
unsigned long offset, res_vma;
-
- if (!allowed)
- return -EFAULT;
+ bool multi_allowed;
/* No gap permitted at the start of the range. */
if (!seen_vma && start < vma->vm_start)
@@ -1867,9 +1866,15 @@ static unsigned long remap_move(struct vma_remap_struct *vrm)
vrm->new_addr = target_addr + offset;
vrm->old_len = vrm->new_len = len;
- allowed = vma_multi_allowed(vma);
- if (seen_vma && !allowed)
- return -EFAULT;
+ multi_allowed = vma_multi_allowed(vma);
+ if (!multi_allowed) {
+ /* This is not the first VMA, abort immediately. */
+ if (seen_vma)
+ return -EFAULT;
+ /* This is the first, but there are more, abort. */
+ if (vma->vm_end < end)
+ return -EFAULT;
+ }
res_vma = check_prep_vma(vrm);
if (!res_vma)
@@ -1878,7 +1883,7 @@ static unsigned long remap_move(struct vma_remap_struct *vrm)
return res_vma;
if (!seen_vma) {
- VM_WARN_ON_ONCE(allowed && res_vma != new_addr);
+ VM_WARN_ON_ONCE(multi_allowed && res_vma != new_addr);
res = res_vma;
}