netdev - [PATCH net v2 4/5] ice: Fix off by one in ice_tc_forward_to

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Date:   Mon,  6 Feb 2023 15:29:33 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Dan Carpenter <dan.carpenter@...cle.com>, netdev@...r.kernel.org,
        anthony.l.nguyen@...el.com,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Bharathi Sreenivas <bharathi.sreenivas@...el.com>,
        Leon Romanovsky <leonro@...dia.com>
Subject: [PATCH net v2 4/5] ice: Fix off by one in ice_tc_forward_to_queue()

From: Dan Carpenter <dan.carpenter@...cle.com>

The > comparison should be >= to prevent reading one element beyond
the end of the array.

The "vsi->num_rxq" is not strictly speaking the number of elements in
the vsi->rxq_map[] array.  The array has "vsi->alloc_rxq" elements and
"vsi->num_rxq" is less than or equal to the number of elements in the
array.  The array is allocated in ice_vsi_alloc_arrays().  It's still
an off by one but it might not access outside the end of the array.

Fixes: 143b86f346c7 ("ice: Enable RX queue selection using skbedit action")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Amritha Nambiar <amritha.nambiar@...el.com>
Tested-by: Bharathi Sreenivas <bharathi.sreenivas@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/net/ethernet/intel/ice/ice_tc_lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
index faba0f857cd9..95f392ab9670 100644
--- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
@@ -1681,7 +1681,7 @@ ice_tc_forward_to_queue(struct ice_vsi *vsi, struct ice_tc_flower_fltr *fltr,
 	struct ice_vsi *ch_vsi = NULL;
 	u16 queue = act->rx_queue;
 
-	if (queue > vsi->num_rxq) {
+	if (queue >= vsi->num_rxq) {
 		NL_SET_ERR_MSG_MOD(fltr->extack,
 				   "Unable to add filter because specified queue is invalid");
 		return -EINVAL;
-- 
2.38.1