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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Christoph Hellwig <hch@lst.de>
Subject: [PATCH 5.8 026/124] nvme-core: put ctrl ref when module ref get fail
Date:   Mon, 12 Oct 2020 15:30:30 +0200
Message-Id: <20201012133148.115584432@linuxfoundation.org>
In-Reply-To: <20201012133146.834528783@linuxfoundation.org>
References: <20201012133146.834528783@linuxfoundation.org>
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From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>

commit 4bab69093044ca81f394bd0780be1b71c5a4d308 upstream.

When try_module_get() fails in the nvme_dev_open() it returns without
releasing the ctrl reference which was taken earlier.

Put the ctrl reference which is taken before calling the
try_module_get() in the error return code path.

Fixes: 52a3974feb1a "nvme-core: get/put ctrl and transport module in nvme_dev_open/release()"
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/nvme/host/core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3061,8 +3061,10 @@ static int nvme_dev_open(struct inode *i
 	}
 
 	nvme_get_ctrl(ctrl);
-	if (!try_module_get(ctrl->ops->module))
+	if (!try_module_get(ctrl->ops->module)) {
+		nvme_put_ctrl(ctrl);
 		return -EINVAL;
+	}
 
 	file->private_data = ctrl;
 	return 0;