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netfilter: conntrack: fix reading nf_conntrack_buckets 

commit f6351c3f1c upstream.

The old way of changing the conntrack hashsize runtime was through changing
the module param via file /sys/module/nf_conntrack/parameters/hashsize. This
was extended to sysctl change in commit 3183ab8997 ("netfilter: conntrack:
allow increasing bucket size via sysctl too").

The commit introduced second "user" variable nf_conntrack_htable_size_user
which shadow actual variable nf_conntrack_htable_size. When hashsize is
changed via module param this "user" variable isn't updated. This results in
sysctl net/netfilter/nf_conntrack_buckets shows the wrong value when users
update via the old way.

This patch fix the issue by always updating "user" variable when reading the
proc file. This will take care of changes to the actual variable without
sysctl need to be aware.

Fixes: 3183ab8997 ("netfilter: conntrack: allow increasing bucket size via sysctl too")
Reported-by: Yoel Caspersen <yoel@kviknet.dk>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Jesper Dangaard Brouer 2021-01-08 12:44:33 +01:00 committed by Greg Kroah-Hartman
parent 548e4168e6
commit 49fc6d92b4
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_conntrack_standalone.c
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@ -521,6 +521,9 @@ nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
{
int ret;
/* module_param hashsize could have changed value */
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (ret < 0 || !write)
return ret;