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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 <ecree@solarflare.com>
Acked-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2014-02-25 13:17:59 +00:00 committed by David S. Miller
parent 9a9bfd032f
commit 8f355e5cee
1 changed files with 7 additions and 0 deletions
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7
drivers/net/ethernet/sfc/ptp.c
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@ -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;