diff options
| author | Petr Pavlu <petr.pavlu@suse.com> | 2024-06-07 14:28:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-21 15:38:35 +0300 |
| commit | 96d3265fc4f1b68e60a5ae7a51b97463cc8c6702 (patch) | |
| tree | 80b6914e6331728df787362fdaaa5fe165ffa1ee /net | |
| parent | 9a3eb4816ab9af25dd2357783e591ef66d5fe616 (diff) | |
| download | linux-96d3265fc4f1b68e60a5ae7a51b97463cc8c6702.tar.xz | |
net/ipv6: Fix the RT cache flush via sysctl using a previous delay
[ Upstream commit 14a20e5b4ad998793c5f43b0330d9e1388446cf3 ]
The net.ipv6.route.flush system parameter takes a value which specifies
a delay used during the flush operation for aging exception routes. The
written value is however not used in the currently requested flush and
instead utilized only in the next one.
A problem is that ipv6_sysctl_rtcache_flush() first reads the old value
of net->ipv6.sysctl.flush_delay into a local delay variable and then
calls proc_dointvec() which actually updates the sysctl based on the
provided input.
Fix the problem by switching the order of the two operations.
Fixes: 4990509f19e8 ("[NETNS][IPV6]: Make sysctls route per namespace.")
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240607112828.30285-1-petr.pavlu@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/route.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 0a37f0417733..29fa2ca07b46 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -6332,12 +6332,12 @@ static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, if (!write) return -EINVAL; - net = (struct net *)ctl->extra1; - delay = net->ipv6.sysctl.flush_delay; ret = proc_dointvec(ctl, write, buffer, lenp, ppos); if (ret) return ret; + net = (struct net *)ctl->extra1; + delay = net->ipv6.sysctl.flush_delay; fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); return 0; } |