This is a note to let you know that I've just added the patch titled net: bridge: fix under estimation in br_get_linkxstats_size() to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-bridge-fix-under-estimation-in-br_get_linkxstats.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 00762820ecff1b7826afc7a521c3eabe5fdc0af9 Author: Eric Dumazet <edumazet@xxxxxxxxxx> Date: Mon Oct 4 18:05:08 2021 -0700 net: bridge: fix under estimation in br_get_linkxstats_size() [ Upstream commit 0854a0513321cf70bea5fa483ebcaa983cc7c62e ] Commit de1799667b00 ("net: bridge: add STP xstats") added an additional nla_reserve_64bit() in br_fill_linkxstats(), but forgot to update br_get_linkxstats_size() accordingly. This can trigger the following in rtnl_stats_get() WARN_ON(err == -EMSGSIZE); Fixes: de1799667b00 ("net: bridge: add STP xstats") Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx> Cc: Vivien Didelot <vivien.didelot@xxxxxxxxx> Cc: Nikolay Aleksandrov <nikolay@xxxxxxxxxx> Acked-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 69c0002f413f..2abfbd4b8a15 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -1658,6 +1658,7 @@ static size_t br_get_linkxstats_size(const struct net_device *dev, int attr) return numvls * nla_total_size(sizeof(struct bridge_vlan_xstats)) + nla_total_size_64bit(sizeof(struct br_mcast_stats)) + + (p ? nla_total_size_64bit(sizeof(p->stp_xstats)) : 0) + nla_total_size(0); }