When old_len == new_len, do_munmap will return -EINVAL due to len == 0.
This errno will be simply ignored because of old_len != new_len check.
So it is unnecessary to call do_munmap when old_len == new_len because
nothing is actually done.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/mremap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/mremap.c b/mm/mremap.c
index e776d4c2345c..dd966621a056 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -817,9 +817,9 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len,
goto out;
}
- if (old_len >= new_len) {
+ if (old_len > new_len) {
ret = do_munmap(mm, addr+new_len, old_len - new_len, uf_unmap);
- if (ret && old_len != new_len)
+ if (ret)
goto out;
old_len = new_len;
}
--
2.23.0
