diff --git a/mm/mmap.c b/mm/mmap.c
index e864a9d9eef72..1094833d0e82e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1761,7 +1761,8 @@ unsigned long unmapped_area(struct vm_unmapped_area_info *info)
 		/* Check if current node has a suitable gap */
 		if (gap_start > high_limit)
 			return -ENOMEM;
-		if (gap_end >= low_limit && gap_end - gap_start >= length)
+		if (gap_end >= low_limit &&
+		    gap_end > gap_start && gap_end - gap_start >= length)
 			goto found;
 
 		/* Visit right subtree if it looks promising */
@@ -1864,7 +1865,8 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info)
 		gap_end = vm_start_gap(vma);
 		if (gap_end < low_limit)
 			return -ENOMEM;
-		if (gap_start <= high_limit && gap_end - gap_start >= length)
+		if (gap_start <= high_limit &&
+		    gap_end > gap_start && gap_end - gap_start >= length)
 			goto found;
 
 		/* Visit left subtree if it looks promising */