From 8f355e5cee63c2c0c145d8206c4245d0189f47ff Mon Sep 17 00:00:00 2001 From: Edward Cree Date: Tue, 25 Feb 2014 13:17:59 +0000 Subject: [PATCH] sfc: check for NULL efx->ptp_data in efx_ptp_event If we receive a PTP event from the NIC when we haven't set up PTP state in the driver, we attempt to read through a NULL pointer efx->ptp_data, triggering a panic. Signed-off-by: Edward Cree Acked-by: Shradha Shah Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/ptp.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c index eb75fbd11a01..d7a36829649a 100644 --- a/drivers/net/ethernet/sfc/ptp.c +++ b/drivers/net/ethernet/sfc/ptp.c @@ -1668,6 +1668,13 @@ void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) struct efx_ptp_data *ptp = efx->ptp_data; int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); + if (!ptp) { + if (net_ratelimit()) + netif_warn(efx, drv, efx->net_dev, + "Received PTP event but PTP not set up\n"); + return; + } + if (!ptp->enabled) return; -- 2.39.5