autofs: remove ino free in autofs4_dir_symlink()

The inode allocation failure case in autofs4_dir_symlink() frees the
autofs dentry info of the dentry without setting ->d_fsdata to NULL.

That could lead to a double free so just get rid of the free and leave it
to ->d_release().

Link: http://lkml.kernel.org/r/20160812024759.12352.10653.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 623510e..2eebeae 100644 (file)
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -577,8 +577,6 @@ static int autofs4_dir_symlink(struct inode *dir,
        inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555);
        if (!inode) {
                kfree(cp);
-               if (!dentry->d_fsdata)
-                       kfree(ino);
                return -ENOMEM;
        }
        inode->i_private = cp;