From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8A80C4332F for ; Tue, 7 Nov 2023 12:10:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234064AbjKGMKr (ORCPT ); Tue, 7 Nov 2023 07:10:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234115AbjKGMKW (ORCPT ); Tue, 7 Nov 2023 07:10:22 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8EC301BDB; Tue, 7 Nov 2023 04:08:36 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84465C433C8; Tue, 7 Nov 2023 12:08:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699358916; bh=936W0rPH+PKEckvlRda9toa0h6+ypEp/Jq+8y6KUhsQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AkXHwMLJGKMMq1evRkfY/kJx0RCqoI6qmoGPeg7xjdMmH+en+MbQm+cp7EUWOvwNS XEPQEVz7LVLc265VZJZDQ5xABX65H+g3z8KX+gh5/PtFQQBDBIDKpJlPpBw7fGFPwN CCxkVCDLrwZwXnvQzDEMwZ/YTT6lMSJoZdCArDQtJheZfyd8Z4UnFUpo+4hX7UHeHt xtOEgfUoBpqCKf4RG4NVuCKAuGt+Uowei9VKGLjzoSwboz7IqMBCtVhge71K2v2Jw2 Mmn6UFjO8SoINzQiqS3lSyyeiozlM/erbrhIfzY17URuW3XK9UUb+OL9UQQW8pFn3b uhAA0je1+FuTw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Gerhard Engleder , kernel test robot , Jacob Keller , Jakub Kicinski , Sasha Levin , davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, maciej.fijalkowski@intel.com, hawk@kernel.org, alexanderduyck@fb.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.6 27/31] tsnep: Fix tsnep_request_irq() format-overflow warning Date: Tue, 7 Nov 2023 07:06:14 -0500 Message-ID: <20231107120704.3756327-27-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107120704.3756327-1-sashal@kernel.org> References: <20231107120704.3756327-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gerhard Engleder [ Upstream commit 00e984cb986b31e9313745e51daceaa1e1eb7351 ] Compiler warns about a possible format-overflow in tsnep_request_irq(): drivers/net/ethernet/engleder/tsnep_main.c:884:55: warning: 'sprintf' may write a terminating nul past the end of the destination [-Wformat-overflow=] sprintf(queue->name, "%s-rx-%d", name, ^ drivers/net/ethernet/engleder/tsnep_main.c:881:55: warning: 'sprintf' may write a terminating nul past the end of the destination [-Wformat-overflow=] sprintf(queue->name, "%s-tx-%d", name, ^ drivers/net/ethernet/engleder/tsnep_main.c:878:49: warning: '-txrx-' directive writing 6 bytes into a region of size between 5 and 25 [-Wformat-overflow=] sprintf(queue->name, "%s-txrx-%d", name, ^~~~~~ Actually overflow cannot happen. Name is limited to IFNAMSIZ, because netdev_name() is called during ndo_open(). queue_index is single char, because less than 10 queues are supported. Fix warning with snprintf(). Additionally increase buffer to 32 bytes, because those 7 additional bytes were unused anyway. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202310182028.vmDthIUa-lkp@intel.com/ Signed-off-by: Gerhard Engleder Reviewed-by: Jacob Keller Link: https://lore.kernel.org/r/20231023183856.58373-1-gerhard@engleder-embedded.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/engleder/tsnep.h | 2 +- drivers/net/ethernet/engleder/tsnep_main.c | 12 ++++++------ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h index 6e14c918e3fb7..f188fba021a62 100644 --- a/drivers/net/ethernet/engleder/tsnep.h +++ b/drivers/net/ethernet/engleder/tsnep.h @@ -143,7 +143,7 @@ struct tsnep_rx { struct tsnep_queue { struct tsnep_adapter *adapter; - char name[IFNAMSIZ + 9]; + char name[IFNAMSIZ + 16]; struct tsnep_tx *tx; struct tsnep_rx *rx; diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c index 8b992dc9bb52b..38da2d6c250e6 100644 --- a/drivers/net/ethernet/engleder/tsnep_main.c +++ b/drivers/net/ethernet/engleder/tsnep_main.c @@ -1779,14 +1779,14 @@ static int tsnep_request_irq(struct tsnep_queue *queue, bool first) dev = queue->adapter; } else { if (queue->tx && queue->rx) - sprintf(queue->name, "%s-txrx-%d", name, - queue->rx->queue_index); + snprintf(queue->name, sizeof(queue->name), "%s-txrx-%d", + name, queue->rx->queue_index); else if (queue->tx) - sprintf(queue->name, "%s-tx-%d", name, - queue->tx->queue_index); + snprintf(queue->name, sizeof(queue->name), "%s-tx-%d", + name, queue->tx->queue_index); else - sprintf(queue->name, "%s-rx-%d", name, - queue->rx->queue_index); + snprintf(queue->name, sizeof(queue->name), "%s-rx-%d", + name, queue->rx->queue_index); handler = tsnep_irq_txrx; dev = queue; } -- 2.42.0