linux-kernel - [PATCH] hv_netvsc: Fix potential dereference of NULL pointer

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Message-Id: <1652962188-129281-1-git-send-email-lyz_cs@pku.edu.cn>
Date:   Thu, 19 May 2022 05:09:48 -0700
From:   Yongzhi Liu <lyz_cs@....edu.cn>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, sashal@...nel.org
Cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, fuyq@....pku.edu.cn,
        Yongzhi Liu <lyz_cs@....edu.cn>
Subject: [PATCH] hv_netvsc: Fix potential dereference of NULL pointer

The return value of netvsc_devinfo_get()
needs to be checked to avoid use of NULL
pointer in case of an allocation failure.

Fixes: 0efeea5fb ("hv_netvsc: Add the support of hibernation")

Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
---
 drivers/net/hyperv/netvsc_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index fde1c49..b1dece6 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2671,7 +2671,10 @@ static int netvsc_suspend(struct hv_device *dev)
 
 	/* Save the current config info */
 	ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
-
+	if (!ndev_ctx->saved_netvsc_dev_info) {
+		ret = -ENOMEM;
+		goto out;
+	}
 	ret = netvsc_detach(net, nvdev);
 out:
 	rtnl_unlock();
-- 
2.7.4