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Date:	Thu, 20 Mar 2014 17:09:12 -0700
From:	Greg Kroah-Hartman <>
Cc:	Greg Kroah-Hartman <>,, Edward Cree <>,
	Shradha Shah <>,
	"David S. Miller" <>
Subject: [PATCH 3.10 09/85] sfc: check for NULL efx->ptp_data in efx_ptp_event

3.10-stable review patch.  If anyone has any objections, please let me know.


From: Edward Cree <>

[ Upstream commit 8f355e5cee63c2c0c145d8206c4245d0189f47ff ]

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 <>
Signed-off-by: Greg Kroah-Hartman <>
 drivers/net/ethernet/sfc/ptp.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -1319,6 +1319,13 @@ void efx_ptp_event(struct efx_nic *efx,
 	struct efx_ptp_data *ptp = efx->ptp_data;
+	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)

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