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iommu: Fix refcount leak in iommu_device_claim_dma_owner

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iommu_group_get() returns the group with the reference incremented.
Move iommu_group_get() after owner check to fix the refcount leak.

Fixes: 89395ccedb ("iommu: Add device-centric DMA ownership interfaces")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20221230083100.1489569-1-linmq006@gmail.com
[ joro: Remove *group = NULL initialization ]
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Miaoqian Lin 2022-12-30 12:31:00 +04:00 committed by Joerg Roedel
parent 32ea2c57dc
commit a6a9a5da68
1 changed files with 5 additions and 3 deletions
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8
drivers/iommu/iommu.c
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@ -3185,14 +3185,16 @@ EXPORT_SYMBOL_GPL(iommu_group_claim_dma_owner);
*/
int iommu_device_claim_dma_owner(struct device *dev, void *owner)
{
struct iommu_group *group = iommu_group_get(dev);
struct iommu_group *group;
int ret = 0;
if (!group)
return -ENODEV;
if (WARN_ON(!owner))
return -EINVAL;
group = iommu_group_get(dev);
if (!group)
return -ENODEV;
mutex_lock(&group->mutex);
if (group->owner_cnt) {
if (group->owner != owner) {