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Check for NULL frame, before dereferencing pointer.

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(closes issue #15617)
 Reported by: rain


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@211232 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2009-08-09 07:11:22 +00:00
parent 4f80468245
commit e05992889b
1 changed files with 6 additions and 1 deletions
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7
apps/app_stack.c
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@@ -474,7 +474,12 @@ static int local_read(struct ast_channel *chan, const char *cmd, char *data, cha
oldlist = stack_store->data;
AST_LIST_LOCK(oldlist);
frame = AST_LIST_FIRST(oldlist);
if (!(frame = AST_LIST_FIRST(oldlist))) {
/* Not within a Gosub routine */
AST_LIST_UNLOCK(oldlist);
return -1;
}
AST_LIST_TRAVERSE(&frame->varshead, variables, entries) {
if (!strcmp(data, ast_var_name(variables))) {
const char *tmp;