linux-kernel - [PATCH] vfio: Fix handling of error returned by 'vfio_group_get_from

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Message-Id: <20161130070612.16073-1-christophe.jaillet@wanadoo.fr>
Date:   Wed, 30 Nov 2016 08:06:12 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     alex.williamson@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] vfio: Fix handling of error returned by 'vfio_group_get_from_dev()'

'vfio_group_get_from_dev()' seems to return only NULL on error, not an error
pointer.

Fixes: 2169037dc322 ("vfio iommu: Added pin and unpin callback functions to vfio_iommu_driver_ops")
Fixes: c086de818dd8 ("vfio iommu: Add blocking notifier to notify DMA_UNMAP")

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This could be split in 2 patches in order to have only one Fixes tag in
each
---
 drivers/vfio/vfio.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 0aac3ca54a53..7b39313abf0d 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1933,8 +1933,8 @@ int vfio_pin_pages(struct device *dev, unsigned long *user_pfn, int npage,
 		return -E2BIG;
 
 	group = vfio_group_get_from_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+	if (!group)
+		return -ENODEV;
 
 	ret = vfio_group_add_container_user(group);
 	if (ret)
@@ -1982,8 +1982,8 @@ int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn, int npage)
 		return -E2BIG;
 
 	group = vfio_group_get_from_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+	if (!group)
+		return -ENODEV;
 
 	ret = vfio_group_add_container_user(group);
 	if (ret)
@@ -2019,8 +2019,8 @@ int vfio_register_notifier(struct device *dev, struct notifier_block *nb)
 		return -EINVAL;
 
 	group = vfio_group_get_from_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+	if (!group)
+		return -ENODEV;
 
 	ret = vfio_group_add_container_user(group);
 	if (ret)
@@ -2055,8 +2055,8 @@ int vfio_unregister_notifier(struct device *dev, struct notifier_block *nb)
 		return -EINVAL;
 
 	group = vfio_group_get_from_dev(dev);
-	if (IS_ERR(group))
-		return PTR_ERR(group);
+	if (!group)
+		return -ENODEV;
 
 	ret = vfio_group_add_container_user(group);
 	if (ret)
-- 
2.9.3