[PATCH net 7/9] sctp: sysctl: udp_port: avoid using current->nsproxy

Matthieu Baerts (NGI0)
2025-01-08T15:35:44Z

The 'net' structure can be obtained from the table->data using
container_of().

Note that table->data could also be used directly, but that would
increase the size of this fix, while 'sctp.ctl_sock' still needs to be
retrieved from 'net' structure.

Fixes: 046c052b475e ("sctp: enable udp tunneling socks")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/67769ecb.050a0220.3a8527.003f.GAE@google.com [1]
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
net/sctp/sysctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 9d29611621feaf0d2e8d7c923601ab374515563b..18fa4f44e8ec8c86f8415b1251ef8a2979c7f823 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -528,7 +528,7 @@ static int proc_sctp_do_auth(const struct ctl_table *ctl, int write,
static int proc_sctp_do_udp_port(const struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
- struct net *net = current->nsproxy->net_ns;
+ struct net *net = container_of(ctl->data, struct net, sctp.udp_port);
unsigned int min = *(unsigned int *)ctl->extra1;
unsigned int max = *(unsigned int *)ctl->extra2;
struct ctl_table tbl;

--
2.47.1