[Intel-wired-lan] [PATCH net v2] i40e: Fix NULL ptr dereference on VSI filter sync

[Michał Małoszewski]

Remove the reason of null pointer dereference in sync vsi filters.
Added new I40E_VSI_RELEASING flag to signalize deleting and releasing
of VSI resources to sync this thread with sync filters subtask.
Without this patch it is possible to start update the vsi filter list
after vsi is removed, that's causing a kernel oops.

Fixes: 17652c6336fd("i40e: remove unused argument")
Signed-off-by: Grzegorz Szczurek <grzegorzx.szczurek at intel.com>
Signed-off by: Michal Maloszewski <michal.maloszewski at intel.com>
Reviewed-by: Przemyslaw Patynowski <przemyslawx.patynowski at intel.com>
Reviewed-by: Fijalkowski, WitoldX <witoldx.fijalkowski at intel.com>
Reviewed-by: Jaroslaw Gawin <jaroslawx.gawin at intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov at intel.com>

---
v2: permissions are changed

 drivers/net/ethernet/intel/i40e/i40e.h      | 1 +
 drivers/net/ethernet/intel/i40e/i40e_main.c | 8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)
 mode change 100644 => 100755 drivers/net/ethernet/intel/i40e/i40e.h
 mode change 100644 => 100755 drivers/net/ethernet/intel/i40e/i40e_main.c

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
old mode 100644
new mode 100755
index b6830e3..558b0ae
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -158,6 +158,7 @@ enum i40e_vsi_state_t {
 	__I40E_VSI_OVERFLOW_PROMISC,
 	__I40E_VSI_REINIT_REQUESTED,
 	__I40E_VSI_DOWN_REQUESTED,
+	__I40E_VSI_RELEASING,
 	/* This must be last as it determines the size of the BITMAP */
 	__I40E_VSI_STATE_SIZE__,
 };
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
old mode 100644
new mode 100755
index 60e68fc..de7b6f5
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2634,9 +2634,9 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf)
 
 	for (v = 0; v < pf->num_alloc_vsi; v++) {
 		if (pf->vsi[v] &&
-		    (pf->vsi[v]->flags & I40E_VSI_FLAG_FILTER_CHANGED)) {
+		    (pf->vsi[v]->flags & I40E_VSI_FLAG_FILTER_CHANGED) &&
+		    !test_bit(__I40E_VSI_RELEASING, pf->vsi[v]->state)) {
 			int ret = i40e_sync_vsi_filters(pf->vsi[v]);
-
 			if (ret) {
 				/* come back and try again later */
 				set_bit(__I40E_MACVLAN_SYNC_PENDING,
@@ -12955,6 +12955,9 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi, struct bpf_prog *prog,
 	/* Don't allow frames that span over multiple buffers */
 	if (frame_size > vsi->rx_buf_len) {
 		NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
+		dev_info(&pf->pdev->dev,
+			 "MTU of %u bytes is too large to enable XDP (maximum: %u bytes)\n",
+			 vsi->netdev->mtu, vsi->rx_buf_len);
 		return -EINVAL;
 	}
 
@@ -13785,6 +13788,7 @@ int i40e_vsi_release(struct i40e_vsi *vsi)
 		return -ENODEV;
 	}
 
+	set_bit(__I40E_VSI_RELEASING, vsi->state);
 	uplink_seid = vsi->uplink_seid;
 	if (vsi->type != I40E_VSI_SRIOV) {
 		if (vsi->netdev_registered) {
-- 
1.8.3.1

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