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From: Tony Nguyen <anthony.l.nguyen@intel.com>
To: davem@davemloft.net, kuba@kernel.org
Cc: Sasha Neftin <sasha.neftin@intel.com>,
	netdev@vger.kernel.org, anthony.l.nguyen@intel.com,
	vitaly.lifshits@intel.com,
	Aleksandr Loktionov <aleksandr.loktionov@intel.com>,
	Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Subject: [PATCH net-next 08/12] igc: Check if num of q_vectors is smaller than max before array access
Date: Tue, 20 Jul 2021 16:20:57 -0700	[thread overview]
Message-ID: <20210720232101.3087589-9-anthony.l.nguyen@intel.com> (raw)
In-Reply-To: <20210720232101.3087589-1-anthony.l.nguyen@intel.com>

From: Sasha Neftin <sasha.neftin@intel.com>

Ensure that the adapter->q_vector[MAX_Q_VECTORS] array isn't accessed
beyond its size. It was fixed by using a local variable num_q_vectors
as a limit for loop index, and ensure that num_q_vectors is not bigger
than MAX_Q_VECTORS.

Suggested-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 11385c380947..f7cf97916390 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -5125,6 +5125,7 @@ static irqreturn_t igc_msix_ring(int irq, void *data)
  */
 static int igc_request_msix(struct igc_adapter *adapter)
 {
+	unsigned int num_q_vectors = adapter->num_q_vectors;
 	int i = 0, err = 0, vector = 0, free_vector = 0;
 	struct net_device *netdev = adapter->netdev;
 
@@ -5133,7 +5134,13 @@ static int igc_request_msix(struct igc_adapter *adapter)
 	if (err)
 		goto err_out;
 
-	for (i = 0; i < adapter->num_q_vectors; i++) {
+	if (num_q_vectors > MAX_Q_VECTORS) {
+		num_q_vectors = MAX_Q_VECTORS;
+		dev_warn(&adapter->pdev->dev,
+			 "The number of queue vectors (%d) is higher than max allowed (%d)\n",
+			 adapter->num_q_vectors, MAX_Q_VECTORS);
+	}
+	for (i = 0; i < num_q_vectors; i++) {
 		struct igc_q_vector *q_vector = adapter->q_vector[i];
 
 		vector++;
-- 
2.26.2


  parent reply	other threads:[~2021-07-20 23:20 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-20 23:20 [PATCH net-next 00/12][pull request] 1GbE Intel Wired LAN Driver Updates 2021-07-20 Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 01/12] e1000e: Add handshake with the CSME to support S0ix Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 02/12] e1000e: Add polling mechanism to indicate CSME DPG exit Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 03/12] e1000e: Additional PHY power saving in S0ix Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 04/12] e1000e: Add support for Lunar Lake Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 05/12] e1000e: Add support for the next LOM generation Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 06/12] e1000e: Add space to the debug print Tony Nguyen
2021-07-20 23:20 ` [PATCH net-next 07/12] net/e1000e: Fix spelling mistake "The" -> "This" Tony Nguyen
2021-07-20 23:20 ` Tony Nguyen [this message]
2021-07-20 23:20 ` [PATCH net-next 09/12] igc: Remove _I_PHY_ID checking Tony Nguyen
2021-07-21 14:50   ` Andrew Lunn
2021-07-21 18:02     ` Sasha Neftin
2021-07-21 19:53       ` Andrew Lunn
2021-07-22  5:22         ` Sasha Neftin
2021-07-20 23:20 ` [PATCH net-next 10/12] igc: Remove phy->type checking Tony Nguyen
2021-07-20 23:21 ` [PATCH net-next 11/12] igc: Set QBVCYCLET_S to 0 for TSN Basic Scheduling Tony Nguyen
2021-07-20 23:21 ` [PATCH net-next 12/12] igc: Increase timeout value for Speed 100/1000/2500 Tony Nguyen
2021-07-21  0:00 ` [PATCH net-next 00/12][pull request] 1GbE Intel Wired LAN Driver Updates 2021-07-20 patchwork-bot+netdevbpf

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