From 5eecd85c77a254a43bde3212da8047b001745c9f Mon Sep 17 00:00:00 2001
From: Adrian Moreno <amorenoz@redhat.com>
Date: Tue, 17 Dec 2024 12:37:39 +0100
Subject: psample: adjust size if rate_as_probability is set
If PSAMPLE_ATTR_SAMPLE_PROBABILITY flag is to be sent, the available
size for the packet data has to be adjusted accordingly.
Also, check the error code returned by nla_put_flag.
Fixes: 7b1b2b60c63f ("net: psample: allow using rate as probability")
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20241217113739.3929300-1-amorenoz@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
net/psample/psample.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
(limited to 'net')
diff --git a/net/psample/psample.c b/net/psample/psample.c
index a0ddae8a65f9..25f92ba0840c 100644
--- a/net/psample/psample.c
+++ b/net/psample/psample.c
@@ -393,7 +393,9 @@ void psample_sample_packet(struct psample_group *group,
nla_total_size_64bit(sizeof(u64)) + /* timestamp */
nla_total_size(sizeof(u16)) + /* protocol */
(md->user_cookie_len ?
- nla_total_size(md->user_cookie_len) : 0); /* user cookie */
+ nla_total_size(md->user_cookie_len) : 0) + /* user cookie */
+ (md->rate_as_probability ?
+ nla_total_size(0) : 0); /* rate as probability */
#ifdef CONFIG_INET
tun_info = skb_tunnel_info(skb);
@@ -498,8 +500,9 @@ void psample_sample_packet(struct psample_group *group,
md->user_cookie))
goto error;
- if (md->rate_as_probability)
- nla_put_flag(nl_skb, PSAMPLE_ATTR_SAMPLE_PROBABILITY);
+ if (md->rate_as_probability &&
+ nla_put_flag(nl_skb, PSAMPLE_ATTR_SAMPLE_PROBABILITY))
+ goto error;
genlmsg_end(nl_skb, data);
genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0,
--
cgit