linux-kernel - [PATCH 5.4 023/111] ice: Fix for dereference of NULL pointer

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Date:   Mon, 12 Apr 2021 10:40:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jacek Bułatek <jacekx.bulatek@...el.com>,
        Haiyue Wang <haiyue.wang@...el.com>,
        Tony Brelinski <tonyx.brelinski@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>
Subject: [PATCH 5.4 023/111] ice: Fix for dereference of NULL pointer

From: Jacek Bułatek <jacekx.bulatek@...el.com>

commit 7a91d3f02b04b2fb18c2dfa8b6c4e5a40a2753f5 upstream.

Add handling of allocation fault for ice_vsi_list_map_info.

Also *fi should not be NULL pointer, it is a reference to raw
data field, so remove this variable and use the reference
directly.

Fixes: 9daf8208dd4d ("ice: Add support for switch filter programming")
Signed-off-by: Jacek Bułatek <jacekx.bulatek@...el.com>
Co-developed-by: Haiyue Wang <haiyue.wang@...el.com>
Signed-off-by: Haiyue Wang <haiyue.wang@...el.com>
Tested-by: Tony Brelinski <tonyx.brelinski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/ice/ice_switch.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -1279,6 +1279,9 @@ ice_add_update_vsi_list(struct ice_hw *h
 			ice_create_vsi_list_map(hw, &vsi_handle_arr[0], 2,
 						vsi_list_id);
 
+		if (!m_entry->vsi_list_info)
+			return ICE_ERR_NO_MEMORY;
+
 		/* If this entry was large action then the large action needs
 		 * to be updated to point to FWD to VSI list
 		 */
@@ -2266,6 +2269,7 @@ ice_vsi_uses_fltr(struct ice_fltr_mgmt_l
 	return ((fm_entry->fltr_info.fltr_act == ICE_FWD_TO_VSI &&
 		 fm_entry->fltr_info.vsi_handle == vsi_handle) ||
 		(fm_entry->fltr_info.fltr_act == ICE_FWD_TO_VSI_LIST &&
+		 fm_entry->vsi_list_info &&
 		 (test_bit(vsi_handle, fm_entry->vsi_list_info->vsi_map))));
 }
 
@@ -2338,14 +2342,12 @@ ice_add_to_vsi_fltr_list(struct ice_hw *
 		return ICE_ERR_PARAM;
 
 	list_for_each_entry(fm_entry, lkup_list_head, list_entry) {
-		struct ice_fltr_info *fi;
-
-		fi = &fm_entry->fltr_info;
-		if (!fi || !ice_vsi_uses_fltr(fm_entry, vsi_handle))
+		if (!ice_vsi_uses_fltr(fm_entry, vsi_handle))
 			continue;
 
 		status = ice_add_entry_to_vsi_fltr_list(hw, vsi_handle,
-							vsi_list_head, fi);
+							vsi_list_head,
+							&fm_entry->fltr_info);
 		if (status)
 			return status;
 	}