From: Paolo Abeni <pabeni@xxxxxxxxxx> [ Upstream commit 4b5af44129d0653a4df44e5511c7d480c61c8f3c ] If a listening MPTCP socket has unaccepted sockets at close time, the related msks are freed via mptcp_sock_destruct(), which in turn does not invoke the proto->destroy() method nor the mptcp_token_destroy() function. Due to the above, the child msk socket is not removed from the token container, leading to later UaF. Address the issue explicitly removing the token even in the above error path. Fixes: 79c0949e9a09 ("mptcp: Add key generation and token tree") Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx> Reviewed-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/mptcp/subflow.c | 1 + 1 file changed, 1 insertion(+) --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -393,6 +393,7 @@ static void mptcp_sock_destruct(struct s sock_orphan(sk); } + mptcp_token_destroy(mptcp_sk(sk)->token); inet_sock_destruct(sk); }