Hiroshi Ito writes:

ash
   "unset OLDPWD; cd -"  causes segmentation fault.
    ( OLDPWD is not set when sh is invoked from getty. )

patch against current CVS is attached.

1 files changed, 1 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index f82a77258..a5929044b 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -2316,6 +2316,7 @@ cdcmd(int argc, char **argv)
                 dest = bltinlookup(homestr);
         else if (dest[0] == '-' && dest[1] == '\0') {
                 dest = bltinlookup("OLDPWD");
+                if ( !dest ) goto out;
                 flags |= CD_PRINT;
                 goto step7;
         }