Commit 296034f7 authored by Steve French's avatar Steve French
Browse files

[CIFS] Don't allow a backslash in a path component 



Unless Posix paths have been negotiated, the backslash, "\", is not a valid
character in a path component.

Signed-off-by: default avatarDave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 0bd4fa97

fs/cifs/dir.c

+14 −0
Original line number Diff line number Diff line
@@ -436,6 +436,20 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct name 
	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);

	pTcon = cifs_sb->tcon;



	/*

	 * Don't allow the separator character in a path component.

	 * The VFS will not allow "/", but "\" is allowed by posix.

	 */

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {

		int i;

		for (i = 0; i < direntry->d_name.len; i++)

			if (direntry->d_name.name[i] == '\\') {

				cFYI(1, ("Invalid file name"));

				FreeXid(xid);

				return ERR_PTR(-EINVAL);

			}

	}



	/* can not grab the rename sem here since it would

	deadlock in the cases (beginning of sys_rename itself)

	in which we already have the sb rename sem */