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From: Tony Nguyen <anthony.l.nguyen@intel.com>
To: davem@davemloft.net, kuba@kernel.org
Cc: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>,
	netdev@vger.kernel.org, anthony.l.nguyen@intel.com,
	Gurucharan G <gurucharanx.g@intel.com>,
	Konrad Jankowski <konrad0.jankowski@intel.com>
Subject: [PATCH net 1/4] ice: Prevent probing virtual functions
Date: Mon,  9 Aug 2021 10:13:59 -0700	[thread overview]
Message-ID: <20210809171402.17838-2-anthony.l.nguyen@intel.com> (raw)
In-Reply-To: <20210809171402.17838-1-anthony.l.nguyen@intel.com>

From: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>

The userspace utility "driverctl" can be used to change/override the
system's default driver choices. This is useful in some situations
(buggy driver, old driver missing a device ID, trying a workaround,
etc.) where the user needs to load a different driver.

However, this is also prone to user error, where a driver is mapped
to a device it's not designed to drive. For example, if the ice driver
is mapped to driver iavf devices, the ice driver crashes.

Add a check to return an error if the ice driver is being used to
probe a virtual function.

Fixes: 837f08fdecbe ("ice: Add basic driver framework for Intel(R) E800 Series")
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index ef8d1815af56..a9506041eb42 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -4194,6 +4194,11 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
 	struct ice_hw *hw;
 	int i, err;
 
+	if (pdev->is_virtfn) {
+		dev_err(dev, "can't probe a virtual function\n");
+		return -EINVAL;
+	}
+
 	/* this driver uses devres, see
 	 * Documentation/driver-api/driver-model/devres.rst
 	 */
-- 
2.26.2


  reply	other threads:[~2021-08-09 17:10 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-09 17:13 [PATCH net 0/4][pull request] Intel Wired LAN Driver Updates 2021-08-09 Tony Nguyen
2021-08-09 17:13 ` Tony Nguyen [this message]
2021-08-09 22:56   ` [PATCH net 1/4] ice: Prevent probing virtual functions Jakub Kicinski
2021-08-09 17:14 ` [PATCH net 2/4] ice: Stop processing VF messages during teardown Tony Nguyen
2021-08-09 22:58   ` Jakub Kicinski
2021-08-10 17:42     ` Venkataramanan, Anirudh
2021-08-10 14:30   ` Jonathan Toppins
2021-08-09 17:14 ` [PATCH net 3/4] ice: don't remove netdev->dev_addr from uc sync list Tony Nguyen
2021-08-10 14:29   ` Jonathan Toppins
2021-08-09 17:14 ` [PATCH net 4/4] iavf: Set RSS LUT and key in reset handle path Tony Nguyen

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