linux-kernel - [PATCH 5.9 530/757] vfio: fix a missed vfio group put in vfio_pin

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Message-Id: <20201027135515.353178869@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:53:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yan Zhao <yan.y.zhao@...el.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 530/757] vfio: fix a missed vfio group put in vfio_pin_pages

From: Yan Zhao <yan.y.zhao@...el.com>

[ Upstream commit 28b130244061863cf0437b7af1625fb45ec1a71e ]

When error occurs, need to put vfio group after a successful get.

Fixes: 95fc87b44104 ("vfio: Selective dirty page tracking if IOMMU backed device pins pages")
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vfio/vfio.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 532bcaf28c11d..2151bc7f87ab1 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1949,8 +1949,10 @@ int vfio_pin_pages(struct device *dev, unsigned long *user_pfn, int npage,
 	if (!group)
 		return -ENODEV;
 
-	if (group->dev_counter > 1)
-		return -EINVAL;
+	if (group->dev_counter > 1) {
+		ret = -EINVAL;
+		goto err_pin_pages;
+	}
 
 	ret = vfio_group_add_container_user(group);
 	if (ret)
-- 
2.25.1