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Commit 2ba902da authored by Edwin Peer's avatar Edwin Peer Committed by Greg Kroah-Hartman
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rtnetlink: extend RTEXT_FILTER_SKIP_STATS to IFLA_VF_INFO 



[ Upstream commit fa0e21fa44438a0e856d42224bfa24641d37b979 ]

This filter already exists for excluding IPv6 SNMP stats. Extend its
definition to also exclude IFLA_VF_INFO stats in RTM_GETLINK.

This patch constitutes a partial fix for a netlink attribute nesting
overflow bug in IFLA_VFINFO_LIST. By excluding the stats when the
requester doesn't need them, the truncation of the VF list is avoided.

While it was technically only the stats added in commit c5a9f6f0
("net/core: Add drop counters to VF statistics") breaking the camel's
back, the appreciable size of the stats data should never have been
included without due consideration for the maximum number of VFs
supported by PCI.

Fixes: 3b766cd8 ("net/core: Add reading VF statistics through the PF netdevice")
Fixes: c5a9f6f0 ("net/core: Add drop counters to VF statistics")
Signed-off-by: default avatarEdwin Peer <edwin.peer@broadcom.com>
Cc: Edwin Peer <espeer@gmail.com>
Signed-off-by: default avatarGal Pressman <gal@nvidia.com>
Link: https://lore.kernel.org/r/20230611105108.122586-1-gal@nvidia.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 786e264b

net/core/rtnetlink.c

+51 −45
Original line number Diff line number Diff line
@@ -922,7 +922,10 @@ static inline int rtnl_vfinfo_size(const struct net_device *dev, 
			 nla_total_size(sizeof(struct ifla_vf_rate)) +

			 nla_total_size(sizeof(struct ifla_vf_link_state)) +

			 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +

			 nla_total_size(0) + /* nest IFLA_VF_STATS */

			 nla_total_size(sizeof(struct ifla_vf_trust)));

		if (~ext_filter_mask & RTEXT_FILTER_SKIP_STATS) {

			size += num_vfs *

				(nla_total_size(0) + /* nest IFLA_VF_STATS */

				 /* IFLA_VF_STATS_RX_PACKETS */

				 nla_total_size_64bit(sizeof(__u64)) +

				 /* IFLA_VF_STATS_TX_PACKETS */
@@ -938,8 +941,8 @@ static inline int rtnl_vfinfo_size(const struct net_device *dev, 
				 /* IFLA_VF_STATS_RX_DROPPED */

				 nla_total_size_64bit(sizeof(__u64)) +

				 /* IFLA_VF_STATS_TX_DROPPED */

			 nla_total_size_64bit(sizeof(__u64)) +

			 nla_total_size(sizeof(struct ifla_vf_trust)));

				 nla_total_size_64bit(sizeof(__u64)));

		}

		return size;

	} else

		return 0;
@@ -1189,7 +1192,8 @@ static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb, 
static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,

					       struct net_device *dev,

					       int vfs_num,

					       struct nlattr *vfinfo)

					       struct nlattr *vfinfo,

					       u32 ext_filter_mask)

{

	struct ifla_vf_rss_query_en vf_rss_query_en;

	struct nlattr *vf, *vfstats, *vfvlanlist;
@@ -1279,6 +1283,7 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 
		goto nla_put_vf_failure;

	}

	nla_nest_end(skb, vfvlanlist);

	if (~ext_filter_mask & RTEXT_FILTER_SKIP_STATS) {

		memset(&vf_stats, 0, sizeof(vf_stats));

		if (dev->netdev_ops->ndo_get_vf_stats)

			dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
@@ -1306,6 +1311,7 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, 
			goto nla_put_vf_failure;

		}

		nla_nest_end(skb, vfstats);

	}

	nla_nest_end(skb, vf);

	return 0;
@@ -1338,7 +1344,7 @@ static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb, 
		return -EMSGSIZE;



	for (i = 0; i < num_vfs; i++) {

		if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))

		if (rtnl_fill_vfinfo(skb, dev, i, vfinfo, ext_filter_mask))

			return -EMSGSIZE;

	}