/usr/sbin/userhelper dumps core if read_string returns NULL (ie. user
presses ctrl-d (no other input)).
This can be reproduced /usr/sbin/userhelper -s -d 1 2 3 (I don't think the
-d parameter matters).
and type anything+enter and immediately press ctrl-d
--> segmentation fault

-Jarno

Here's a patch (this fixes that seg. fault, but I don't know if this is
correct way to fix it).

--- usermode-1.36/userhelper.c-orig     Mon Oct 30 13:39:18 2000
+++ usermode-1.36/userhelper.c  Mon Oct 30 13:40:51 2000
@@ -234,7 +234,7 @@
            case PAM_PROMPT_ECHO_OFF:
                reply[count].resp_retcode = PAM_SUCCESS;
                reply[count].resp = read_string();
-               if(reply[count].resp[0] == UH_ABORT) {
+               if(reply[count].resp && reply[count].resp[0] == UH_ABORT) {
                     fallback_flag = TRUE;
                    free (reply);
                    return PAM_MAXTRIES; /* Shrug. */