[nail-devel] nail core dumps on smime signing / folder removal (fix included)

[Martin N. <ne...@ga...>]

nail has a small "y/n" questionaire utility which will segfault
when the user just hits return.

Repeat-by:
	Either		"set asksign", compose a msg, just hit return
	or		"remove /etc/motd",  just hit return

These are all places which call yorn() and can therfore trigger the bug.
The patch below will guard against this.

							Martin

Index: tty.c
===================================================================
RCS file: /cvsroot/nail/nail/tty.c,v
retrieving revision 1.10
diff -u -r1.10 tty.c
--- tty.c	4 Mar 2006 00:32:16 -0000	1.10
+++ tty.c	8 Mar 2007 16:01:39 -0000
@@ -430,6 +430,6 @@
 		return 1;
 	do
 		cp = readtty(msg, NULL);
-	while (*cp != 'y' && *cp != 'Y' && *cp != 'n' && *cp != 'N');
+	while (!cp || *cp != 'y' && *cp != 'Y' && *cp != 'n' && *cp != 'N');
 	return *cp == 'y' || *cp == 'Y';
 }