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 C7E3D30FA4 for ; Wed, 20 Sep 2023 12:18:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52CEEC433C8; Wed, 20 Sep 2023 12:18:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695212317; bh=36qHRyHyPyA5GaI6rgOr/7q7kaoqLCnykXSZxNKTRD0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KcLmpD7fDtcurABq1lSCUrIn6Hd1HHNxuCSrRtZiMUh4v4G108iDlwr7LGC+RYhLD rdA5IBF95KuYsFBwlZg3EreyGKMvDhB0AqB69lHIDd1r61E6rFE2Qp1PWicA27yZqH kQY4PnD0rOzTnxroZ508DWxpw7EUNMUEy24kxdjw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hangyu Hua , Simon Horman , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 231/273] net: ethernet: mtk_eth_soc: fix possible NULL pointer dereference in mtk_hwlro_get_fdir_all() Date: Wed, 20 Sep 2023 13:31:11 +0200 Message-ID: <20230920112853.519764627@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112846.440597133@linuxfoundation.org> References: <20230920112846.440597133@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hangyu Hua [ Upstream commit e4c79810755f66c9a933ca810da2724133b1165a ] rule_locs is allocated in ethtool_get_rxnfc and the size is determined by rule_cnt from user space. So rule_cnt needs to be check before using rule_locs to avoid NULL pointer dereference. Fixes: 7aab747e5563 ("net: ethernet: mediatek: add ethtool functions to configure RX flows of HW LRO") Signed-off-by: Hangyu Hua Reviewed-by: Simon Horman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 53cff913abf0b..1a4f96894cd70 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1621,6 +1621,9 @@ static int mtk_hwlro_get_fdir_all(struct net_device *dev, int i; for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) { + if (cnt == cmd->rule_cnt) + return -EMSGSIZE; + if (mac->hwlro_ip[i]) { rule_locs[cnt] = i; cnt++; -- 2.40.1