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

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Message-Id: <1653103862-36104-1-git-send-email-lyz_cs@pku.edu.cn>
Date:   Fri, 20 May 2022 20:31:02 -0700
From:   Yongzhi Liu <lyz_cs@....edu.cn>
To:     agross@...nel.org, bjorn.andersson@...aro.org, jic23@...nel.org,
        lars@...afoo.de, svarbanov@...sol.com, iivanov@...sol.com,
        jonathan.cameron@...wei.com
Cc:     linux-arm-msm@...r.kernel.org, linux-iio@...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