Messages in this thread Patch in this message | | | Subject | [PATCH net-next 1/2] rxrpc: Fix a potential NULL-pointer deref in rxrpc_abort_calls | From | David Howells <> | Date | Tue, 30 Aug 2016 16:39:38 +0100 |
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The call pointer in a channel on a connection will be NULL if there's no active call on that channel. rxrpc_abort_calls() needs to check for this before trying to take the call's state_lock.
Signed-off-by: David Howells <dhowells@redhat.com> ---
net/rxrpc/conn_event.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c index 6296374df840..bb81801fb805 100644 --- a/net/rxrpc/conn_event.c +++ b/net/rxrpc/conn_event.c @@ -149,19 +149,23 @@ static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state, call = rcu_dereference_protected( conn->channels[i].call, lockdep_is_held(&conn->channel_lock)); - write_lock_bh(&call->state_lock); - if (call->state <= RXRPC_CALL_COMPLETE) { - call->state = state; - if (state == RXRPC_CALL_LOCALLY_ABORTED) { - call->local_abort = conn->local_abort; - set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); - } else { - call->remote_abort = conn->remote_abort; - set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); + if (call) { + write_lock_bh(&call->state_lock); + if (call->state <= RXRPC_CALL_COMPLETE) { + call->state = state; + if (state == RXRPC_CALL_LOCALLY_ABORTED) { + call->local_abort = conn->local_abort; + set_bit(RXRPC_CALL_EV_CONN_ABORT, + &call->events); + } else { + call->remote_abort = conn->remote_abort; + set_bit(RXRPC_CALL_EV_RCVD_ABORT, + &call->events); + } + rxrpc_queue_call(call); } - rxrpc_queue_call(call); + write_unlock_bh(&call->state_lock); } - write_unlock_bh(&call->state_lock); } spin_unlock(&conn->channel_lock);
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