Bug#411240: kolab-cyrus-imapd: Fix bug 411240 by checking for null data pointers in quota_read

[David Härdeman]

tags 411240 +patch
thanks

The attached patch changes the quota_read function from imap/quota_db.c 
to check for a null data pointer (caused by zero length files) before 
trying to work with it. Thanks to Ulrich P. Klein for the detailed BR.

--
David Härdeman
diff -ur ./kolab-cyrus-imapd-2.2.13.orig/imap/quota_db.c ./kolab-cyrus-imapd-2.2.13/imap/quota_db.c
--- ./kolab-cyrus-imapd-2.2.13.orig/imap/quota_db.c	2004-05-22 05:45:52.000000000 +0200
+++ ./kolab-cyrus-imapd-2.2.13/imap/quota_db.c	2007-02-20 23:21:38.000000000 +0100
@@ -89,6 +89,8 @@
 
     switch (r) {
     case CYRUSDB_OK:
+	if (!data)
+		return IMAP_IOERROR;
 	sscanf(data, "%lu %d", &quota->used, &quota->limit);
 	break;