Fix pointer confusion for nested attribute parsing

A reference to a pointer is passed as data,
the resulting attribute payload should be stored in
the dereferenced location to return it to the caller.

diff --git a/src/netlink.c b/src/netlink.c
index c0b60c2..aaac8c4 100644 (file)
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -337,7 +337,7 @@ static int link_filter_cb (const struct nlmsghdr *nlh,
 #if HAVE_TCA_STATS2
 static int qos_attr_cb (const struct nlattr *attr, void *data)
 {
-  struct gnet_stats_basic *bs = *(struct gnet_stats_basic **)data;
+  struct gnet_stats_basic **bs = (struct gnet_stats_basic **)data;
 
   /* skip unsupported attribute in user-space */
   if (mnl_attr_type_valid (attr, TCA_STATS_MAX) < 0)
@@ -345,12 +345,12 @@ static int qos_attr_cb (const struct nlattr *attr, void *data)
 
   if (mnl_attr_get_type (attr) == TCA_STATS_BASIC)
   {
-    if (mnl_attr_validate2 (attr, MNL_TYPE_UNSPEC, sizeof (*bs)) < 0)
+    if (mnl_attr_validate2 (attr, MNL_TYPE_UNSPEC, sizeof (**bs)) < 0)
     {
       ERROR ("netlink plugin: qos_attr_cb: TCA_STATS_BASIC mnl_attr_validate2 failed.");
       return MNL_CB_ERROR;
     }
-    bs = mnl_attr_get_payload (attr);
+    *bs = mnl_attr_get_payload (attr);
     return MNL_CB_STOP;
   }