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From:   Huazhong Tan <tanhuazhong@huawei.com>
To:     <davem@davemloft.net>
CC:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <salil.mehta@huawei.com>, <yisen.zhuang@huawei.com>,
        <linuxarm@huawei.com>, <nhorman@redhat.com>,
        Huazhong Tan <tanhuazhong@huawei.com>,
        Peng Li <lipeng321@huawei.com>
Subject: [PATCH V3 net-next 10/11] net: hns3: prevent double free in hns3_put_ring_config()
Date:   Thu, 25 Apr 2019 20:42:54 +0800
Message-ID: <1556196175-65389-11-git-send-email-tanhuazhong@huawei.com>
In-Reply-To: <1556196175-65389-1-git-send-email-tanhuazhong@huawei.com>
References: <1556196175-65389-1-git-send-email-tanhuazhong@huawei.com>
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Sender: linux-kernel-owner@vger.kernel.org
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This patch adds a check for the hns3_put_ring_config() to prevent
double free, and for more readable, move the NULL assignment of
priv->ring_data into the hns3_put_ring_config().

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 7dc281c..b0f31eb 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -3487,6 +3487,7 @@ static int hns3_get_ring_config(struct hns3_nic_priv *priv)
 	}
 
 	devm_kfree(&pdev->dev, priv->ring_data);
+	priv->ring_data = NULL;
 	return ret;
 }
 
@@ -3495,12 +3496,16 @@ static void hns3_put_ring_config(struct hns3_nic_priv *priv)
 	struct hnae3_handle *h = priv->ae_handle;
 	int i;
 
+	if (!priv->ring_data)
+		return;
+
 	for (i = 0; i < h->kinfo.num_tqps; i++) {
 		devm_kfree(priv->dev, priv->ring_data[i].ring);
 		devm_kfree(priv->dev,
 			   priv->ring_data[i + h->kinfo.num_tqps].ring);
 	}
 	devm_kfree(priv->dev, priv->ring_data);
+	priv->ring_data = NULL;
 }
 
 static int hns3_alloc_ring_memory(struct hns3_enet_ring *ring)
@@ -3920,8 +3925,6 @@ static void hns3_client_uninit(struct hnae3_handle *handle, bool reset)
 
 	hns3_dbg_uninit(handle);
 
-	priv->ring_data = NULL;
-
 out_netdev_free:
 	free_netdev(netdev);
 }
@@ -4268,12 +4271,10 @@ static int hns3_reset_notify_init_enet(struct hnae3_handle *handle)
 	hns3_uninit_all_ring(priv);
 err_uninit_vector:
 	hns3_nic_uninit_vector_data(priv);
-	priv->ring_data = NULL;
 err_dealloc_vector:
 	hns3_nic_dealloc_vector_data(priv);
 err_put_ring:
 	hns3_put_ring_config(priv);
-	priv->ring_data = NULL;
 
 	return ret;
 }
@@ -4335,7 +4336,6 @@ static int hns3_reset_notify_uninit_enet(struct hnae3_handle *handle)
 		netdev_err(netdev, "uninit ring error\n");
 
 	hns3_put_ring_config(priv);
-	priv->ring_data = NULL;
 
 	return ret;
 }
-- 
2.7.4