[PATCH] mm/shmem.c: Fix the missing unaccount on the failed path

[Tianjia Zhang]

In function __shmem_file_setup(), shmem_unacct_size() is forgotten
on the failed path, so add it.

Fixes: 93dec2da7b234 ("... and switch shmem_file_setup() to 
alloc_file_pseudo()")
Cc: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Tianjia Zhang <tianjia.zh...@linux.alibaba.com>
---
 mm/shmem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 8e2b35ba93ad..591410dc3541 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4200,8 +4200,10 @@ static struct file *__shmem_file_setup(struct vfsmount 
*mnt, const char *name, l
        if (!IS_ERR(res))
                res = alloc_file_pseudo(inode, mnt, name, O_RDWR,
                                &shmem_file_operations);
-       if (IS_ERR(res))
+       if (IS_ERR(res)) {
                iput(inode);
+               shmem_unacct_size(flags, size);
+       }
        return res;
 }
 
-- 
2.19.1.3.ge56e4f7