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 08D032E85B for ; Tue, 14 Nov 2023 21:59:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mk9OTnav" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBC1FC433C8; Tue, 14 Nov 2023 21:59:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699999153; bh=2f2t+MmUaELKZlNTBEHK7FKdgavZAHuT6kVf/MoOuzg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mk9OTnavUqHGsvchRt2wYVQUC69PxJZr52phPs5h3UarQIR+/EqitdHUbT527RJb9 Dvwk/2Y6flyU9gnqvXN5atPn00etx2RN0AFTaS/iI3nzwFtiPOou8VeQcIJBg2x42J GYHJDRQnkipmTFYmwtJlidq41hiMv/tYFBukq7AJC+qCcMvtk4Ebm1UHDJhdDsB3i8 /5UXVtsIFo6El8Ayg4kWZQSpIbpY/p9x+nXo9G3Ygl/Tz0BcAq0Ae7KPKLUAccB34H eC9UihCisLCBtsX9tCvZcTPR2+NlA/B9OHl6NujNm5I9hXVA7d0AWo6Fywnu5vz3sC vaZOXtWk54FAg== From: Saeed Mahameed To: "David S. Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet Cc: Saeed Mahameed , netdev@vger.kernel.org, Tariq Toukan , Rahul Rameshbabu , Dragos Tatulea Subject: [net V2 15/15] net/mlx5e: Check return value of snprintf writing to fw_version buffer for representors Date: Tue, 14 Nov 2023 13:58:46 -0800 Message-ID: <20231114215846.5902-16-saeed@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231114215846.5902-1-saeed@kernel.org> References: <20231114215846.5902-1-saeed@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Rahul Rameshbabu Treat the operation as an error case when the return value is equivalent to the size of the name buffer. Failed to write null terminator to the name buffer, making the string malformed and should not be used. Provide a string with only the firmware version when forming the string with the board id fails. This logic for representors is identical to normal flow with ethtool. Without check, will trigger -Wformat-truncation with W=1. drivers/net/ethernet/mellanox/mlx5/core/en_rep.c: In function 'mlx5e_rep_get_drvinfo': drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:78:31: warning: '%.16s' directive output may be truncated writing up to 16 bytes into a region of size between 13 and 22 [-Wformat-truncation=] 78 | "%d.%d.%04d (%.16s)", | ^~~~~ drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:77:9: note: 'snprintf' output between 12 and 37 bytes into a destination of size 32 77 | snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 78 | "%d.%d.%04d (%.16s)", | ~~~~~~~~~~~~~~~~~~~~~ 79 | fw_rev_maj(mdev), fw_rev_min(mdev), | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 80 | fw_rev_sub(mdev), mdev->board_id); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fixes: cf83c8fdcd47 ("net/mlx5e: Add missing ethtool driver info for representors") Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d4ab2e97dcfbcd748ae71761a9d8e5e41cc732c Signed-off-by: Rahul Rameshbabu Reviewed-by: Dragos Tatulea Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c index 693e55b010d9..3ab682bbcf86 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c @@ -71,13 +71,17 @@ static void mlx5e_rep_get_drvinfo(struct net_device *dev, { struct mlx5e_priv *priv = netdev_priv(dev); struct mlx5_core_dev *mdev = priv->mdev; + int count; strscpy(drvinfo->driver, mlx5e_rep_driver_name, sizeof(drvinfo->driver)); - snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), - "%d.%d.%04d (%.16s)", - fw_rev_maj(mdev), fw_rev_min(mdev), - fw_rev_sub(mdev), mdev->board_id); + count = snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), + "%d.%d.%04d (%.16s)", fw_rev_maj(mdev), + fw_rev_min(mdev), fw_rev_sub(mdev), mdev->board_id); + if (count == sizeof(drvinfo->fw_version)) + snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), + "%d.%d.%04d", fw_rev_maj(mdev), + fw_rev_min(mdev), fw_rev_sub(mdev)); } static const struct counter_desc sw_rep_stats_desc[] = { -- 2.41.0