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

[=?unknown-8bit?q?Micha=C5=82_Ma=C5=82oszewski?= <michal.maloszewski@intel.com>]

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@intel.com>
Signed-off by: Michal Maloszewski <michal.maloszewski@intel.com>
Reviewed-by: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>
Reviewed-by: Fijalkowski, WitoldX <witoldx.fijalkowski@intel.com>
Reviewed-by: Jaroslaw Gawin <jaroslawx.gawin@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@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

---------------------------------------------------------------------
Intel Technology Poland sp. z o.o.
ul. Sowackiego 173 | 80-298 Gdask | Sd Rejonowy Gdask Pnoc | VII Wydzia Gospodarczy Krajowego Rejestru Sdowego - KRS 101882 | NIP 957-07-52-316 | Kapita zakadowy 200.000 PLN.
Ta wiadomo wraz z zacznikami jest przeznaczona dla okrelonego adresata i moe zawiera informacje poufne. W razie przypadkowego otrzymania tej wiadomoci, prosimy o powiadomienie nadawcy oraz trwae jej usunicie; jakiekolwiek przegldanie lub rozpowszechnianie jest zabronione.
This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). If you are not the intended recipient, please contact the sender and delete all copies; any review or distribution by others is strictly prohibited.