linux-kernel - [PATCH] net: benet: use snprintf instead sprintf and IFNAMSIZ instead hardcoded constant.

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Message-Id: <20221004095034.377665-1-pkosyh@yandex.ru>
Date:   Tue,  4 Oct 2022 12:50:34 +0300
From:   Peter Kosyh <pkosyh@...dex.ru>
To:     Ajit Khaparde <ajit.khaparde@...adcom.com>
Cc:     Peter Kosyh <pkosyh@...dex.ru>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.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] net: benet: use snprintf instead sprintf and IFNAMSIZ instead hardcoded constant.

printf to array 'eqo->desc' of size 32 may cause buffer overflow when
using non-standard IFNAMSIZ.

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

Signed-off-by: Peter Kosyh <pkosyh@...dex.ru>
---
 drivers/net/ethernet/emulex/benet/be.h      | 2 +-
 drivers/net/ethernet/emulex/benet/be_main.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 61fe9625bed1..857a25f45fc8 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -179,7 +179,7 @@ static inline void queue_tail_inc(struct be_queue_info *q)
 
 struct be_eq_obj {
 	struct be_queue_info q;
-	char desc[32];
+	char desc[IFNAMSIZ+16];
 
 	struct be_adapter *adapter;
 	struct napi_struct napi;
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 414362febbb9..8e75a14da595 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -3485,7 +3485,7 @@ static int be_msix_register(struct be_adapter *adapter)
 	int status, i, vec;
 
 	for_all_evt_queues(adapter, eqo, i) {
-		sprintf(eqo->desc, "%s-q%d", netdev->name, i);
+		snprintf(eqo->desc, sizeof(eqo->desc), "%s-q%d", netdev->name, i);
 		vec = be_msix_vec_get(adapter, eqo);
 		status = request_irq(vec, be_msix, 0, eqo->desc, eqo);
 		if (status)
-- 
2.37.0