From mboxrd@z Thu Jan 1 00:00:00 1970 From: Govindarajulu Varadarajan <_govind@gmx.com> Subject: [PATCH net 2/3] enic: check return value for stat dump Date: Thu, 11 Jun 2015 11:52:55 +0530 Message-ID: <1434003776-31840-2-git-send-email-_govind@gmx.com> References: <1434003776-31840-1-git-send-email-_govind@gmx.com> Cc: ssujith@cisco.com, benve@cisco.com, Govindarajulu Varadarajan <_govind@gmx.com> To: davem@davemloft.net, netdev@vger.kernel.org Return-path: Received: from mout.gmx.net ([212.227.15.19]:60419 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750891AbbFKGXg (ORCPT ); Thu, 11 Jun 2015 02:23:36 -0400 In-Reply-To: <1434003776-31840-1-git-send-email-_govind@gmx.com> Sender: netdev-owner@vger.kernel.org List-ID: We do not check the return value of enic_dev_stats_dump(). If allocation fails, we will hit NULL pointer reference. Return only if memory allocation fails. For other failures, we return the previously recorded values. Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com> --- drivers/net/ethernet/cisco/enic/enic_ethtool.c | 20 +++++++++++++++++--- drivers/net/ethernet/cisco/enic/enic_main.c | 9 ++++++++- 2 files changed, 25 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/cisco/enic/enic_ethtool.c b/drivers/net/ethernet/cisco/enic/enic_ethtool.c index 28d9ca6..68d47b1 100644 --- a/drivers/net/ethernet/cisco/enic/enic_ethtool.c +++ b/drivers/net/ethernet/cisco/enic/enic_ethtool.c @@ -131,8 +131,15 @@ static void enic_get_drvinfo(struct net_device *netdev, { struct enic *enic = netdev_priv(netdev); struct vnic_devcmd_fw_info *fw_info; + int err; - enic_dev_fw_info(enic, &fw_info); + err = enic_dev_fw_info(enic, &fw_info); + /* return only when pci_zalloc_consistent fails in vnic_dev_fw_info + * For other failures, like devcmd failure, we return previously + * recorded info. + */ + if (err == -ENOMEM) + return; strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); @@ -181,8 +188,15 @@ static void enic_get_ethtool_stats(struct net_device *netdev, struct enic *enic = netdev_priv(netdev); struct vnic_stats *vstats; unsigned int i; - - enic_dev_stats_dump(enic, &vstats); + int err; + + err = enic_dev_stats_dump(enic, &vstats); + /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump + * For other failures, like devcmd failure, we return previously + * recorded stats. + */ + if (err == -ENOMEM) + return; for (i = 0; i < enic_n_tx_stats; i++) *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].index]; diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c index 0e5a01d..eadae1b 100644 --- a/drivers/net/ethernet/cisco/enic/enic_main.c +++ b/drivers/net/ethernet/cisco/enic/enic_main.c @@ -615,8 +615,15 @@ static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev, { struct enic *enic = netdev_priv(netdev); struct vnic_stats *stats; + int err; - enic_dev_stats_dump(enic, &stats); + err = enic_dev_stats_dump(enic, &stats); + /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump + * For other failures, like devcmd failure, we return previously + * recorded stats. + */ + if (err == -ENOMEM) + return net_stats; net_stats->tx_packets = stats->tx.tx_frames_ok; net_stats->tx_bytes = stats->tx.tx_bytes_ok; -- 2.4.2