lkml.org 
[lkml]   [2021]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] iommu: Check dev->iommu in iommu_dev_xxx functions
Date
The device iommu probe/attach might have failed leaving dev->iommu
to NULL and device drivers may still invoke these functions resulting
a crash in iommu vendor driver code. Hence make sure we check that.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
drivers/iommu/iommu.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ffeebda8d6de..cb68153c5cc0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2867,7 +2867,7 @@ bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;

- if (ops && ops->dev_has_feat)
+ if (dev->iommu && ops && ops->dev_has_feat)
return ops->dev_has_feat(dev, feat);

return false;
@@ -2878,7 +2878,7 @@ int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;

- if (ops && ops->dev_enable_feat)
+ if (dev->iommu && ops && ops->dev_enable_feat)
return ops->dev_enable_feat(dev, feat);

return -ENODEV;
@@ -2894,7 +2894,7 @@ int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;

- if (ops && ops->dev_disable_feat)
+ if (dev->iommu && ops && ops->dev_disable_feat)
return ops->dev_disable_feat(dev, feat);

return -EBUSY;
@@ -2905,7 +2905,7 @@ bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;

- if (ops && ops->dev_feat_enabled)
+ if (dev->iommu && ops && ops->dev_feat_enabled)
return ops->dev_feat_enabled(dev, feat);

return false;
--
2.17.1
\
 
 \ /
  Last update: 2021-01-26 14:09    [W:0.937 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site