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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jacob Keller <jacob.e.keller@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        Sasha Levin <sashal@kernel.org>,
        Gurucharan <gurucharanx.g@intel.com>
Subject: [PATCH 5.15 417/530] ice: set tx_tstamps when creating new Tx rings via ethtool
Date:   Mon, 24 Oct 2022 13:32:41 +0200
Message-Id: <20221024113103.964838222@linuxfoundation.org>
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From: Jacob Keller <jacob.e.keller@intel.com>

[ Upstream commit b3b173745c8cab1e24d6821488b60abed3acb24d ]

When the user changes the number of queues via ethtool, the driver
allocates new rings. This allocation did not initialize tx_tstamps. This
results in the tx_tstamps field being zero (due to kcalloc allocation), and
would result in a NULL pointer dereference when attempting a transmit
timestamp on the new ring.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Gurucharan <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/intel/ice/ice_ethtool.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 9b9c2b885486..f10d9c377c74 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -2788,6 +2788,7 @@ ice_set_ringparam(struct net_device *netdev, struct ethtool_ringparam *ring)
 		tx_rings[i].count = new_tx_cnt;
 		tx_rings[i].desc = NULL;
 		tx_rings[i].tx_buf = NULL;
+		tx_rings[i].tx_tstamps = &pf->ptp.port.tx;
 		err = ice_setup_tx_ring(&tx_rings[i]);
 		if (err) {
 			while (i--)
-- 
2.35.1