clang compiler warnings: Fix sometimes-uninitialized warning in pbx_config

This patch fixes a warning caught by clang, in which a char pointer could be
assigned to before it was initialized. The patch re-organizes the code to
ensure that the pointer is always initialized, even on off nominal paths.

Review: https://reviewboard.asterisk.org/r/4529

ASTERISK-24917
Reported by: dkdegroot
patches:
  rb4529.patch submitted by dkdegroot (License 6600)
........

Merged revisions 434090 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@434091 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/pbx/pbx_config.c b/pbx/pbx_config.c
index 1dd09850c6d8faf18ba20c5ae3e8501ef6c41d0e..79260bbadd27f98f828c34c2c7954e85d489f629 100644 (file)
--- a/pbx/pbx_config.c
+++ b/pbx/pbx_config.c
@@ -956,7 +956,9 @@ static char *handle_cli_dialplan_save(struct ast_cli_entry *e, int cmd, struct a
                                        const char *el = ast_get_extension_label(p);
                                        char label[128] = "";
                                        char *appdata = ast_get_extension_app_data(p);
-                                       char *escaped;
+
+                                       int escaped_len = (!ast_strlen_zero(appdata)) ? 2 * strlen(appdata) + 1 : 1;
+                                       char escaped[escaped_len];
 
                                        if (ast_get_extension_matchcid(p)) {
                                                sep = "/";
@@ -970,12 +972,9 @@ static char *handle_cli_dialplan_save(struct ast_cli_entry *e, int cmd, struct a
                                        }
 
                                        if (!ast_strlen_zero(appdata)) {
-                                               int escaped_len = 2 * strlen(appdata) + 1;
-                                               char escaped[escaped_len];
-
                                                ast_escape_semicolons(appdata, escaped, escaped_len);
                                        } else {
-                                               escaped = "";
+                                               escaped[0] = '\0';
                                        }
 
                                        fprintf(output, "exten => %s%s%s,%d%s,%s(%s)\n",