[PATCH 5.10 43/96] ice: Prevent probing virtual functions

Greg Kroah-Hartman
2021-08-16T13:17:19Z

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

[ Upstream commit 50ac7479846053ca8054be833c1594e64de496bb ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 1567ddd4c5b8..6421e9fd69a2 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3991,6 +3991,11 @@ 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
*/
--
2.30.2