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[net,10/14] mptcp: pm: check add_addr_accept_max before accepting new ADD_ADDR

Message ID 20240819-net-mptcp-pm-reusing-id-v1-10-38035d40de5b@kernel.org
State Accepted
Commit 0137a3c7c2ea3f9df8ebfc65d78b4ba712a187bb
Headers show
Series mptcp: pm: fix IDs not being reusable | expand

Commit Message

Matthieu Baerts (NGI0) Aug. 19, 2024, 7:45 p.m. UTC 
The limits might have changed in between, it is best to check them
before accepting new ADD_ADDR.

Fixes: d0876b2284cf ("mptcp: add the incoming RM_ADDR support")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm_netlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 882781571c7b..28a9a3726146 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -848,8 +848,8 @@  static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
 			/* Note: if the subflow has been closed before, this
 			 * add_addr_accepted counter will not be decremented.
 			 */
-			msk->pm.add_addr_accepted--;
-			WRITE_ONCE(msk->pm.accept_addr, true);
+			if (--msk->pm.add_addr_accepted < mptcp_pm_get_add_addr_accept_max(msk))
+				WRITE_ONCE(msk->pm.accept_addr, true);
 		}
 	}
 }