Fix incorrect ACL behavior when CIDR notation of "/0" is used.

AST-2010-003

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@248946 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/acl.c b/main/acl.c
index 3c01fb65b6e866b475bfd2223d6897ad5ab1f836..67c05b03ca77889adf7cfa12ce7fbcc6969489eb 100644 (file)
--- a/main/acl.c
+++ b/main/acl.c
@@ -298,7 +298,14 @@ struct ast_ha *ast_append_ha(const char *sense, const char *stuff, struct ast_ha
 
                if (!strchr(nm, '.')) {
                        if ((sscanf(nm, "%30d", &x) == 1) && (x >= 0) && (x <= 32)) {
-                               ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x));
+                               if (x == 0) {
+                                       /* This is special-cased to prevent unpredictable
+                                        * behavior of shifting left 32 bits
+                                        */
+                                       ha->netmask.s_addr = 0;
+                               } else {
+                                       ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x));
+                               }
                        } else {
                                ast_log(LOG_WARNING, "Invalid CIDR in %s\n", stuff);
                                ast_free(ha);