diff -up ksh-20120801/src/cmd/ksh93/bltins/cd_pwd.c.cdfix2 ksh-20120801/src/cmd/ksh93/bltins/cd_pwd.c

--- ksh-20120801/src/cmd/ksh93/bltins/cd_pwd.c.cdfix2	2013-02-01 16:46:50.441771371 +0100

+++ ksh-20120801/src/cmd/ksh93/bltins/cd_pwd.c	2013-02-01 16:57:43.241784024 +0100

@@ -61,6 +61,7 @@ int sh_diropenat(Shell_t *shp, int dir,

 {

 	int fd,shfd;

 	int savederrno=errno;

+	struct stat fs;

 #ifndef AT_FDCWD

 	NOT_USED(dir);

 #endif

@@ -133,6 +134,13 @@ int sh_diropenat(Shell_t *shp, int dir,

 	if(fd < 0)

 		return fd;

+	

+	if (!fstat(fd, &fs) && !S_ISDIR(fs.st_mode))

+	{

+	  close(fd);

+	  errno = ENOTDIR;

+	  return -1;

+	}

 	/* Move fd to a number > 10 and *register* the fd number with the shell */

 	shfd = sh_fcntl(fd, F_dupfd_cloexec, 10);