[PATCH] fs: autofs: fix memory leak in autofs_fill_super()

[Jeffin Philip <jeffinphilip14@gmail.com>]

In autofs_fill_super(), we create a new inode using
autofs_new_ino(), however, if we fail to create root_inode,
(that is, root_inode failure path), we return -ENOMEM without
freeing the new inode(ino) that we created causing a memory leak.
Fix this by adding autofs_free_ino() to free the inode we created
in root_inode failure path before returning ENOMEM.

Reported-by: syzbot+df1db6e034b3953e19f5@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=df1db6e034b3953e19f5
Fixes: 66917f85db60 ("autofs: add: new_inode check in autofs_fill_super()")
Cc: stable@vger.kernel.org
Signed-off-by: Jeffin Philip <jeffinphilip14@gmail.com>
---
 fs/autofs/inode.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index c1e210cec436..6b15a3717ba7 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -323,8 +323,10 @@ static int autofs_fill_super(struct super_block *s, struct fs_context *fc)
 		return -ENOMEM;
 
 	root_inode = autofs_get_inode(s, S_IFDIR | 0755);
-	if (!root_inode)
+	if (!root_inode) {
+		autofs_free_ino(ino);
 		return -ENOMEM;
+	}
 
 	root_inode->i_uid = ctx->uid;
 	root_inode->i_gid = ctx->gid;
-- 
2.55.0