[PATCH -next] mm/mmap: fix error return code in do_mas_align_munmap()

[Yang Yingliang]

Return error code when munmap_sidetree() fails in do_mas_align_munmap().

Fixes: 81f5504dfb36 ("mm/mmap: change do_mas_align_munmap() to avoid preallocations for sidetree")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 mm/mmap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 1bdf56804048..bb978061a790 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2427,7 +2427,8 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
 
 			mas_set(mas, end);
 			split = mas_prev(mas, 0);
-			if (munmap_sidetree(split, &mas_detach))
+			error = munmap_sidetree(split, &mas_detach);
+			if (error)
 				goto munmap_sidetree_failed;
 
 			count++;
@@ -2435,7 +2436,8 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
 				vma = split;
 			break;
 		}
-		if (munmap_sidetree(next, &mas_detach))
+		error = munmap_sidetree(next, &mas_detach);
+		if (error)
 			goto munmap_sidetree_failed;
 
 		count++;
-- 
2.25.1