linux-kernel - [PATCH 4.19 17/49] nvme-core: put ctrl ref when module ref get fail

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201012132630.238981493@linuxfoundation.org>
Date:   Mon, 12 Oct 2020 15:27:03 +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,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH 4.19 17/49] nvme-core: put ctrl ref when module ref get fail

From: Chaitanya Kulkarni <chaitanya.kulkarni@....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@....com>
Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -2606,8 +2606,10 @@ 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;