acl.c: Coerce a NULL pointer into the empty string

If an ACL is misconfigured in the realtime database (for instance, the
"rule" is blank) and Asterisk attempts to read the ACL, Asterisk will
crash.

ASTERISK-28978 #close

Change-Id: Ic1536c4df856231bfd2da00128f7822224d77610

diff --git a/main/acl.c b/main/acl.c
index a560046574378071fd14fc52f9067fa06ade182f..2a40fae51ae559fff4548461681bf3f2e3e7ea5b 100644 (file)
--- a/main/acl.c
+++ b/main/acl.c
@@ -578,7 +578,7 @@ static struct ast_ha *append_ha_core(const char *sense, const char *stuff, struc
        struct ast_ha *ha;
        struct ast_ha *prev = NULL;
        struct ast_ha *ret;
-       char *tmp, *list = ast_strdupa(stuff);
+       char *tmp, *list = ast_strdupa(stuff ?: "");
        char *address = NULL, *mask = NULL;
        int addr_is_v4;
        int allowing = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;