rtnetlink: fix if_nlmsg_stats_size() under estimation

rtnl_fill_statsinfo() is filling skb with one mandatory if_stats_msg structure.

nlmsg_put(skb, pid, seq, type, sizeof(struct if_stats_msg), flags);

But if_nlmsg_stats_size() never considered the needed storage.

This bug did not show up because alloc_skb(X) allocates skb with
extra tailroom, because of added alignments. This could very well
be changed in the future to have deterministic behavior.

Fixes: 10c9ead9f3c6 ("rtnetlink: add new RTM_GETSTATS message to dump link stats")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Roopa Prabhu <roopa@nvidia.com>
Acked-by: Roopa Prabhu <roopa@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 972c8cb..8ccce85 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -5262,7 +5262,7 @@ nla_put_failure:
 static size_t if_nlmsg_stats_size(const struct net_device *dev,
                                  u32 filter_mask)
 {
-       size_t size = 0;
+       size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
 
        if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
                size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));