[AppArmor 38/47] Switch to vfs_permission() in sys_fchdir()

[John@suse.de, Johansen@suse.de]

Switch from file_permission() to vfs_permission() in sys_fchdir(): this
avoids calling permission() with a NULL nameidata here.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: John Johansen <jjohansen@suse.de>

---
 fs/open.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/fs/open.c
+++ b/fs/open.c
@@ -512,8 +512,8 @@ out:
 
 asmlinkage long sys_fchdir(unsigned int fd)
 {
+	struct nameidata nd;
 	struct file *file;
-	struct inode *inode;
 	int error;
 
 	error = -EBADF;
@@ -521,15 +521,16 @@ asmlinkage long sys_fchdir(unsigned int 
 	if (!file)
 		goto out;
 
-	inode = file->f_path.dentry->d_inode;
+	nd.path = file->f_path;
+	nd.flags = 0;
 
 	error = -ENOTDIR;
-	if (!S_ISDIR(inode->i_mode))
+	if (!S_ISDIR(nd.path.dentry->d_inode->i_mode))
 		goto out_putf;
 
-	error = file_permission(file, MAY_EXEC);
+	error = vfs_permission(&nd, MAY_EXEC);
 	if (!error)
-		set_fs_pwd(current->fs, &file->f_path);
+		set_fs_pwd(current->fs, &nd.path);
 out_putf:
 	fput(file);
 out:

-- 

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