1 files changed, 2 insertions, 0 deletions

diff --git a/net/rxrpc/ar-error.c b/net/rxrpc/ar-error.c
index 2c27df1ffa17..6cb3e8890e7e 100644
--- a/net/rxrpc/ar-error.c
+++ b/net/rxrpc/ar-error.c
@@ -100,8 +100,10 @@ void rxrpc_UDP_error_report(struct sock *sk)
                 }
 
                 if (mtu < peer->mtu) {
+                        spin_lock_bh(&peer->lock);
                         peer->mtu = mtu;
                         peer->maxdata = peer->mtu - peer->hdrsize;
+                        spin_unlock_bh(&peer->lock);
                         _net("Net MTU %u (maxdata %u)",
                              peer->mtu, peer->maxdata);
                 }