From: Yan Zhao <yan.y.zhao@intel.com>
Date: Wed, 16 Sep 2020 10:29:27 +0800
Subject: vfio: fix a missed vfio group put in vfio_pin_pages
Git-commit: 28b130244061863cf0437b7af1625fb45ec1a71e
Patch-mainline: v5.10-rc1
References: bsc#1181213

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@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
 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 532bcaf28c11..2151bc7f87ab 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)