linux-kernel - [PATCH 5.18 122/339] vdpa: Fix error logic in vdpa_nl_cmd_dev_get

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Date:   Mon, 13 Jun 2022 12:09:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Si-Wei Liu <si-wei.liu@...cle.com>,
        Jason Wang <jasowang@...hat.com>, Eli Cohen <elic@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 122/339] vdpa: Fix error logic in vdpa_nl_cmd_dev_get_doit

From: Eli Cohen <elic@...dia.com>

[ Upstream commit 7a6691f1f89784f775fa0c54be57533445726068 ]

In vdpa_nl_cmd_dev_get_doit(), if the call to genlmsg_reply() fails we
must not call nlmsg_free() since this is done inside genlmsg_reply().

Fix it.

Fixes: bc0d90ee021f ("vdpa: Enable user to query vdpa device info")
Reviewed-by: Si-Wei Liu <si-wei.liu@...cle.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Eli Cohen <elic@...dia.com>
Message-Id: <20220518133804.1075129-2-elic@...dia.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vdpa/vdpa.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 2b75c00b1005..fac89a0d8178 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -756,14 +756,19 @@ static int vdpa_nl_cmd_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
 		goto mdev_err;
 	}
 	err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0, info->extack);
-	if (!err)
-		err = genlmsg_reply(msg, info);
+	if (err)
+		goto mdev_err;
+
+	err = genlmsg_reply(msg, info);
+	put_device(dev);
+	mutex_unlock(&vdpa_dev_mutex);
+	return err;
+
 mdev_err:
 	put_device(dev);
 err:
 	mutex_unlock(&vdpa_dev_mutex);
-	if (err)
-		nlmsg_free(msg);
+	nlmsg_free(msg);
 	return err;
 }
 
-- 
2.35.1