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imap4d: reject invalid month in date2tm()

--- a/sys/src/cmd/upas/imap4d/date.c

+++ b/sys/src/cmd/upas/imap4d/date.c

@@ -235,6 +235,8 @@

 	}else{

 		tm->mday = strtoul(flds[1], nil, 10);

 		tm->mon = dateindex(flds[2], monname, 12);

+		if(tm->mon < 0)

+			return nil;

 		tm->year = strtoul(flds[3], nil, 10);

 		if(strlen(flds[3]) > 2)

 			tm->year -= 1900;