From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F25172E40A for ; Tue, 7 Nov 2023 12:11:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="C0NRDTfZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64839C43395; Tue, 7 Nov 2023 12:11:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699359105; bh=asByYHsdBksFuI0CrpUpI8UvGIEJQr2ZQy7TgjzrI4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C0NRDTfZHt2iuR4CpiG9prrhleGQ0Y4RYu+jweQuMRW45buYtjZTxD2YsymTvTk2a 5/ok2KT+Dg/GTTTJxGdUvRh9otpke1WhxOzTF2R7t08YV8UTCqggTJpFSMteVmUose pSmey9fXxUnjVVlIqZ7siGbaKndsPlPRWOna6xXU+eXK4WDWFhGy930uHcZ+dvHJuN O/J/PXQJXEQFnQ5b3pF5lj7NW1gV+V+FUu+z/2kfcPx0I6SC0vyGhOCgs2Hq0geWPg JbOgni/vhlzs3mEIqAbTT5rMexvrPNlTNOjx3oPAPQr2lDpeZNNk8odaHwqvmCwLPA nMO2arwnBnZow== 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, alexanderduyck@fb.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 16/18] tsnep: Fix tsnep_request_irq() format-overflow warning Date: Tue, 7 Nov 2023 07:10:46 -0500 Message-ID: <20231107121104.3757943-16-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107121104.3757943-1-sashal@kernel.org> References: <20231107121104.3757943-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.61 Content-Transfer-Encoding: 8bit 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 09a723b827c77..0a0d3d7ba63b3 100644 --- a/drivers/net/ethernet/engleder/tsnep.h +++ b/drivers/net/ethernet/engleder/tsnep.h @@ -123,7 +123,7 @@ 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 2be518db04270..c86dfbce787f1 100644 --- a/drivers/net/ethernet/engleder/tsnep_main.c +++ b/drivers/net/ethernet/engleder/tsnep_main.c @@ -973,14 +973,14 @@ 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