Commit ee01a14d authored by Al Viro's avatar Al Viro
Browse files

cifs: close sget() races 



have ->s_fs_info set by the set() callback passed to sget()

Acked-by: default avatarPavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent d757d71b

fs/cifs/cifsfs.c

+9 −3
Original line number Diff line number Diff line
@@ -629,6 +629,13 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb) 
	return dparent;

}



static int cifs_set_super(struct super_block *sb, void *data)

{

	struct cifs_mnt_data *mnt_data = data;

	sb->s_fs_info = mnt_data->cifs_sb;

	return set_anon_super(sb, NULL);

}



static struct dentry *

cifs_do_mount(struct file_system_type *fs_type,

	      int flags, const char *dev_name, void *data)
@@ -678,14 +685,14 @@ cifs_do_mount(struct file_system_type *fs_type, 
	mnt_data.cifs_sb = cifs_sb;

	mnt_data.flags = flags;



	sb = sget(fs_type, cifs_match_super, set_anon_super, &mnt_data);

	sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);

	if (IS_ERR(sb)) {

		root = ERR_CAST(sb);

		cifs_umount(cifs_sb);

		goto out;

	}



	if (sb->s_fs_info) {

	if (sb->s_root) {

		cFYI(1, "Use existing superblock");

		cifs_umount(cifs_sb);

		goto out_shared;
@@ -694,7 +701,6 @@ cifs_do_mount(struct file_system_type *fs_type, 
	sb->s_flags = flags;

	/* BB should we make this contingent on mount parm? */

	sb->s_flags |= MS_NODIRATIME | MS_NOATIME;

	sb->s_fs_info = cifs_sb;



	rc = cifs_read_super(sb);

	if (rc) {