Issue 10055 - Change memory allocation to use the heap for a command, since the output has the potential to overflow the stack (as it did here)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@72556 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/manager.c

@@ -1636,17 +1636,26 @@ static int action_command(struct mansession *s, const struct message *m)
 	/* FIXME: Wedge a ActionID response in here, waiting for later changes */
 	ast_cli_command(fd, cmd);	/* XXX need to change this to use a FILE * */
 	l = lseek(fd, 0, SEEK_END);	/* how many chars available */
-	buf = alloca(l + 1);
+
-	final_buf = alloca(l + 1);
+	/* This has a potential to overflow the stack.  Hence, use the heap. */
+	buf = ast_calloc(1, l + 1);
+	final_buf = ast_calloc(1, l + 1);
+	if (buf) {
 		lseek(fd, 0, SEEK_SET);
 		read(fd, buf, l);
 		buf[l] = '\0';
-	close(fd);
+		if (final_buf) {
-	unlink(template);
 			term_strip(final_buf, buf, l);
 			final_buf[l] = '\0';
-	astman_append(s, final_buf);
+		}
+		astman_append(s, S_OR(final_buf, buf));
+		ast_free(buf);
+	}
+	close(fd);
+	unlink(template);
 	astman_append(s, "--END COMMAND--\r\n\r\n");
+	if (final_buf)
+		ast_free(final_buf);
 	return 0;
 }