diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 6fd5386a1d64..c04a4d0889ae 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -1824,6 +1824,7 @@ static int br_fill_linkxstats(struct sk_buff *skb, const struct net_device *dev, int *prividx, int attr) { + unsigned int limit = U16_MAX - nla_total_size(0); struct nlattr *nla __maybe_unused; struct net_bridge_port *p = NULL; struct net_bridge_vlan_group *vg; @@ -1841,6 +1842,7 @@ static int br_fill_linkxstats(struct sk_buff *skb, p = br_port_get_rtnl(dev); if (!p) return 0; + limit -= nla_total_size_64bit(sizeof(p->stp_xstats)); br = p->br; vg = nbp_vlan_group(p); break; @@ -1855,6 +1857,9 @@ static int br_fill_linkxstats(struct sk_buff *skb, if (vg) { u16 pvid; +#ifdef CONFIG_BRIDGE_IGMP_SNOOPING + limit -= nla_total_size_64bit(sizeof(struct br_mcast_stats)); +#endif pvid = br_get_pvid(vg); list_for_each_entry(v, &vg->vlan_list, vlist) { struct bridge_vlan_xstats vxi; @@ -1862,6 +1867,11 @@ static int br_fill_linkxstats(struct sk_buff *skb, if (++vl_idx < *prividx) continue; + + if (skb_tail_pointer(skb) - (unsigned char *)nest + + nla_total_size(sizeof(vxi)) >= limit) + goto nla_put_failure; + memset(&vxi, 0, sizeof(vxi)); vxi.vid = v->vid; vxi.flags = v->flags; diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index df042da422ef..511c25bf6f2a 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -6328,8 +6328,9 @@ static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 0, &filters, &idxattr, &prividx, extack); if (err < 0) { - /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */ - WARN_ON(err == -EMSGSIZE); + /* -EMSGSIZE implies BUG in if_nlmsg_stats_size + * or a too big nested attribute. + */ kfree_skb(nskb); } else { err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);