Bug#451819: bash: clear_console segv if stdin isn't tty

[OGAWA Hirofumi]

Package: bash
Version: 3.1dfsg-8
Severity: normal

I've found the bug of "clear_console".

It happened on shutdown process.  If "login" was killed before "bash",
the session will be gone. So ttyname() will return NULL. Then
"clear_console" will die with SEGV if .bash_logout runs "clear_console".

The attached patch fixes it by does nothing if stdin is not tty.
-- 
OGAWA Hirofumi <[EMAIL PROTECTED]>


--- bash-3.1dfsg/debian/clear_console.c.orig	2007-11-19 03:52:34.000000000 +0900
+++ bash-3.1dfsg/debian/clear_console.c	2007-11-19 03:45:10.000000000 +0900
@@ -139,6 +139,9 @@ int is_pseudo_tty(int fd)
 {
   char *tty = ttyname(fd);
 
+  if (tty == NULL)
+    return -1;
+
   if (!strncmp(tty, "/dev/pts/", 9))
     return 1;