From: Hao Chen Date: Mon, 9 May 2022 07:55:27 +0000 (+0800) Subject: net: hns3: fix access null pointer issue when set tx-buf-size as 0 X-Git-Tag: microblaze-v5.20~161^2~160^2~5 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=a4fe9b6db6f93694fa14b41e764a2c0f147f13da;p=linux-2.6-microblaze.git net: hns3: fix access null pointer issue when set tx-buf-size as 0 When set tx-buf-size as 0 by ethtool, hns3_init_tx_spare_buffer() will return directly and priv->ring->tx_spare->len is uninitialized, then print function access priv->ring->tx_spare->len will cause this issue. When set tx-buf-size as 0 by ethtool, the print function will print 0 directly and not access priv->ring->tx_spare->len. Fixes: 2373b35c24ff ("net: hns3: add log for setting tx spare buf size") Signed-off-by: Hao Chen Signed-off-by: Guangbin Huang Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c index 1db8a86f046d..6d20974519fe 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c @@ -1915,8 +1915,11 @@ static int hns3_set_tunable(struct net_device *netdev, return ret; } - netdev_info(netdev, "the active tx spare buf size is %u, due to page order\n", - priv->ring->tx_spare->len); + if (!priv->ring->tx_spare) + netdev_info(netdev, "the active tx spare buf size is 0, disable tx spare buffer\n"); + else + netdev_info(netdev, "the active tx spare buf size is %u, due to page order\n", + priv->ring->tx_spare->len); break; default: