linux-kernel - [PATCH 5.10 030/102] net: psample: Fix netlink skb length with tunnel info

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Date:   Fri,  5 Mar 2021 13:20:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yotam Gigi <yotam.gi@...il.com>,
        Ido Schimmel <idosch@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        Chris Mi <cmi@...dia.com>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.10 030/102] net: psample: Fix netlink skb length with tunnel info

From: Chris Mi <cmi@...dia.com>

commit a93dcaada2ddb58dbc72652b42548adedd646d7a upstream.

Currently, the psample netlink skb is allocated with a size that does
not account for the nested 'PSAMPLE_ATTR_TUNNEL' attribute and the
padding required for the 64-bit attribute 'PSAMPLE_TUNNEL_KEY_ATTR_ID'.
This can result in failure to add attributes to the netlink skb due
to insufficient tail room. The following error message is printed to
the kernel log: "Could not create psample log message".

Fix this by adjusting the allocation size to take into account the
nested attribute and the padding.

Fixes: d8bed686ab96 ("net: psample: Add tunnel support")
CC: Yotam Gigi <yotam.gi@...il.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Chris Mi <cmi@...dia.com>
Link: https://lore.kernel.org/r/20210225075145.184314-1-cmi@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/psample/psample.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/psample/psample.c
+++ b/net/psample/psample.c
@@ -309,10 +309,10 @@ static int psample_tunnel_meta_len(struc
 	unsigned short tun_proto = ip_tunnel_info_af(tun_info);
 	const struct ip_tunnel_key *tun_key = &tun_info->key;
 	int tun_opts_len = tun_info->options_len;
-	int sum = 0;
+	int sum = nla_total_size(0);	/* PSAMPLE_ATTR_TUNNEL */
 
 	if (tun_key->tun_flags & TUNNEL_KEY)
-		sum += nla_total_size(sizeof(u64));
+		sum += nla_total_size_64bit(sizeof(u64));
 
 	if (tun_info->mode & IP_TUNNEL_INFO_BRIDGE)
 		sum += nla_total_size(0);