Merged revisions 332761 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/10

................
  r332761 | rmudgett | 2011-08-22 12:05:35 -0500 (Mon, 22 Aug 2011) | 22 lines
  
  Merged revisions 332759 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.8
  
  ........
    r332759 | rmudgett | 2011-08-22 12:00:03 -0500 (Mon, 22 Aug 2011) | 15 lines
    
    Memory leak reading realtime database variable list.
    
    Calling ast_load_realtime() can leak the last list node if the read list
    only contains empty variable value items.
    
    * Fixed list filter loop in ast_load_realtime() to delete the list node
    immediately instead of the next time through the loop.  The next time
    through the loop may not happen if the node to delete is the last in the
    list.
    
    (issue ASTERISK-18277)
    (issue ASTERISK-18265)
    Patches:
          jira_asterisk_18265_v1.8_config.patch (license #5621) patch uploaded by rmudgett
  ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@332762 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 32 insertions, 22 deletions

diff --git a/main/config.c b/main/config.c
index 02b2bf628..ef1b1c854 100644
--- a/main/config.c
+++ b/main/config.c
@@ -396,6 +396,14 @@ static void ast_comment_destroy(struct ast_comment **comment)
 	*comment = NULL;
 }
 
+static void ast_variable_destroy(struct ast_variable *doomed)
+{
+	ast_comment_destroy(&doomed->precomments);
+	ast_comment_destroy(&doomed->sameline);
+	ast_comment_destroy(&doomed->trailing);
+	ast_free(doomed);
+}
+
 void ast_variables_destroy(struct ast_variable *v)
 {
 	struct ast_variable *vn;
@@ -403,10 +411,7 @@ void ast_variables_destroy(struct ast_variable *v)
 	while (v) {
 		vn = v;
 		v = v->next;
-		ast_comment_destroy(&vn->precomments);
-		ast_comment_destroy(&vn->sameline);
-		ast_comment_destroy(&vn->trailing);
-		ast_free(vn);
+		ast_variable_destroy(vn);
 	}
 }
 
@@ -2142,32 +2147,37 @@ struct ast_variable *ast_load_realtime_all(const char *family, ...)
 
 struct ast_variable *ast_load_realtime(const char *family, ...)
 {
-	struct ast_variable *res, *cur, *prev = NULL, *freeme = NULL;
+	struct ast_variable *res;
+	struct ast_variable *cur;
+	struct ast_variable **prev;
 	va_list ap;
 
 	va_start(ap, family);
 	res = ast_load_realtime_helper(family, ap);
 	va_end(ap);
 
-	/* Eliminate blank entries */
-	for (cur = res; cur; cur = cur->next) {
-		if (freeme) {
-			ast_free(freeme);
-			freeme = NULL;
-		}
-
+	/* Filter the list. */
+	prev = &res;
+	cur = res;
+	while (cur) {
 		if (ast_strlen_zero(cur->value)) {
-			if (prev)
-				prev->next = cur->next;
-			else
-				res = cur->next;
-			freeme = cur;
-		} else if (cur->value[0] == ' ' && cur->value[1] == '\0') {
-			char *vptr = (char *) cur->value;
-			vptr[0] = '\0';
-			prev = cur;
+			/* Eliminate empty entries */
+			struct ast_variable *next;
+
+			next = cur->next;
+			*prev = next;
+			ast_variable_destroy(cur);
+			cur = next;
 		} else {
-			prev = cur;
+			/* Make blank entries empty and keep them. */
+			if (cur->value[0] == ' ' && cur->value[1] == '\0') {
+				char *vptr = (char *) cur->value;
+
+				vptr[0] = '\0';
+			}
+
+			prev = &cur->next;
+			cur = cur->next;
 		}
 	}
 	return res;