6.12-stable review patch. If anyone has any objections, please let me know.
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From: Emil Tantilov emil.s.tantilov@intel.com
[ Upstream commit 118082368c2b6ddefe6cb607efc312285148f044 ]
Attempting to remove the driver will cause a crash in cases where the vport failed to initialize. Following trace is from an instance where the driver failed during an attempt to create a VF: [ 1661.543624] idpf 0000:84:00.7: Device HW Reset initiated [ 1722.923726] idpf 0000:84:00.7: Transaction timed-out (op:1 cookie:2900 vc_op:1 salt:29 timeout:60000ms) [ 1723.353263] BUG: kernel NULL pointer dereference, address: 0000000000000028 ... [ 1723.358472] RIP: 0010:idpf_remove+0x11c/0x200 [idpf] ... [ 1723.364973] Call Trace: [ 1723.365475] <TASK> [ 1723.365972] pci_device_remove+0x42/0xb0 [ 1723.366481] device_release_driver_internal+0x1a9/0x210 [ 1723.366987] pci_stop_bus_device+0x6d/0x90 [ 1723.367488] pci_stop_and_remove_bus_device+0x12/0x20 [ 1723.367971] pci_iov_remove_virtfn+0xbd/0x120 [ 1723.368309] sriov_disable+0x34/0xe0 [ 1723.368643] idpf_sriov_configure+0x58/0x140 [idpf] [ 1723.368982] sriov_numvfs_store+0xda/0x1c0
Avoid the NULL pointer dereference by adding NULL pointer check for vport_config[i], before freeing user_config.q_coalesce.
Fixes: e1e3fec3e34b ("idpf: preserve coalescing settings across resets") Signed-off-by: Emil Tantilov emil.s.tantilov@intel.com Reviewed-by: Chittim Madhu madhu.chittim@intel.com Reviewed-by: Simon Horman horms@kernel.org Tested-by: Samuel Salin Samuel.salin@intel.com Reviewed-by: Aleksandr Loktionov aleksandr.loktionov@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/idpf/idpf_main.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/intel/idpf/idpf_main.c b/drivers/net/ethernet/intel/idpf/idpf_main.c index 4c48a1a6aab0d..d7a7b0c5f1b8d 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_main.c +++ b/drivers/net/ethernet/intel/idpf/idpf_main.c @@ -62,6 +62,8 @@ static void idpf_remove(struct pci_dev *pdev) destroy_workqueue(adapter->vc_event_wq);
for (i = 0; i < adapter->max_vports; i++) { + if (!adapter->vport_config[i]) + continue; kfree(adapter->vport_config[i]->user_config.q_coalesce); kfree(adapter->vport_config[i]); adapter->vport_config[i] = NULL;