fix a null pointer deref in vi's search

SVN-Revision: 13073

package/busybox/patches/480-vi_search.patch

@@ -0,0 +1,35 @@
+--- a/editors/vi.c
++++ b/editors/vi.c
+@@ -3313,7 +3313,7 @@
+ 		buf[1] = '\0';
+ 		q = get_input_line(buf);	// get input line- use "status line"
+ 		if (q[0] && !q[1]) {
+-			if (last_search_pattern[0])
++			if (last_search_pattern)
+ 			    last_search_pattern[0] = c;
+ 			goto dc3; // if no pat re-use old pat
+ 		}
+@@ -3329,6 +3329,10 @@
+ 		if (cmdcnt-- > 1) {
+ 			do_cmd(c);
+ 		}				// repeat cnt
++		if (last_search_pattern == 0) {
++			msg = "No previous regular expression";
++			goto dc2;
++		}
+ 		dir = BACK;		// assume BACKWARD search
+ 		p = dot - 1;
+ 		if (last_search_pattern[0] == '?') {
+@@ -3348,10 +3352,8 @@
+ 			msg = "No previous regular expression";
+ 			goto dc2;
+ 		}
+-		if (last_search_pattern[0] == '/') {
+-			dir = FORWARD;	// assume FORWARD search
+-			p = dot + 1;
+-		}
++		dir = FORWARD;	// assume FORWARD search
++		p = dot + 1;
+ 		if (last_search_pattern[0] == '?') {
+ 			dir = BACK;
+ 			p = dot - 1;