[PATCH 1/1] iommufd: Fix error pointer checking

[Lu Baolu]

Smatch static checker reported below warning:

    drivers/iommu/iommufd/fault.c:131 iommufd_device_get_attach_handle()
    warn: 'handle' is an error pointer or valid

Fix it by checking 'handle' with IS_ERR().

Fixes: b7d8833677ba ("iommufd: Fault-capable hwpt attach/detach/replace")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Closes: https://lore.kernel.org/linux-iommu/8bb4f37a-4514-4dea-aabb-7380be303895@stanley.mountain/
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/iommu/iommufd/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c
index e6bda84865f0..29f522819759 100644
--- a/drivers/iommu/iommufd/fault.c
+++ b/drivers/iommu/iommufd/fault.c
@@ -128,7 +128,7 @@ iommufd_device_get_attach_handle(struct iommufd_device *idev)
 	struct iommu_attach_handle *handle;
 
 	handle = iommu_attach_handle_get(idev->igroup->group, IOMMU_NO_PASID, 0);
-	if (!handle)
+	if (IS_ERR(handle))
 		return NULL;
 
 	return to_iommufd_handle(handle);
-- 
2.34.1