netdev - [PATCH] bna: replace sprintf with snprintf, BNA_Q_NAME

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Date:   Tue,  4 Oct 2022 13:42:17 +0300
From:   Peter Kosyh <pkosyh@...dex.ru>
To:     Rasesh Mody <rmody@...vell.com>
Cc:     Peter Kosyh <pkosyh@...dex.ru>,
        Sudarsana Kalluru <skalluru@...vell.com>,
        GR-Linux-NIC-Dev@...vell.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH] bna: replace sprintf with snprintf,  BNA_Q_NAME_SIZE is depends on IFNAMSIZ

BNA_Q_NAME_SIZE is just 16, so buffer overflow with long interface
name is possible.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Peter Kosyh <pkosyh@...dex.ru>
---
 drivers/net/ethernet/brocade/bna/bna_types.h | 2 +-
 drivers/net/ethernet/brocade/bna/bnad.c      | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/brocade/bna/bna_types.h b/drivers/net/ethernet/brocade/bna/bna_types.h
index 666b6922e24d..979dbab9f960 100644
--- a/drivers/net/ethernet/brocade/bna/bna_types.h
+++ b/drivers/net/ethernet/brocade/bna/bna_types.h
@@ -410,7 +410,7 @@ struct bna_ib {
 /* Tx object */
 
 /* Tx datapath control structure */
-#define BNA_Q_NAME_SIZE		16
+#define BNA_Q_NAME_SIZE		IFNAMSIZ
 struct bna_tcb {
 	/* Fast path */
 	void			**sw_qpt;
diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index 29dd0f93d6c0..770392e35908 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -1535,7 +1535,8 @@ bnad_tx_msix_register(struct bnad *bnad, struct bnad_tx_info *tx_info,
 
 	for (i = 0; i < num_txqs; i++) {
 		vector_num = tx_info->tcb[i]->intr_vector;
-		sprintf(tx_info->tcb[i]->name, "%s TXQ %d", bnad->netdev->name,
+		snprintf(tx_info->tcb[i]->name, BNA_Q_NAME_SIZE,
+				"%s TXQ %d", bnad->netdev->name,
 				tx_id + tx_info->tcb[i]->id);
 		err = request_irq(bnad->msix_table[vector_num].vector,
 				  (irq_handler_t)bnad_msix_tx, 0,
@@ -1586,8 +1587,8 @@ bnad_rx_msix_register(struct bnad *bnad, struct bnad_rx_info *rx_info,
 
 	for (i = 0; i < num_rxps; i++) {
 		vector_num = rx_info->rx_ctrl[i].ccb->intr_vector;
-		sprintf(rx_info->rx_ctrl[i].ccb->name, "%s CQ %d",
-			bnad->netdev->name,
+		snprintf(rx_info->rx_ctrl[i].ccb->name, BNA_Q_NAME_SIZE,
+			"%s CQ %d", bnad->netdev->name,
 			rx_id + rx_info->rx_ctrl[i].ccb->id);
 		err = request_irq(bnad->msix_table[vector_num].vector,
 				  (irq_handler_t)bnad_msix_rx, 0,
-- 
2.37.0