[4.4,24/48] iommu: Fix reference count leak in iommu_group_alloc.
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Message ID 20200601173959.379801531@linuxfoundation.org
State New
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Series
  • Untitled series #446653
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Commit Message

Greg KH June 1, 2020, 5:53 p.m. UTC
From: Qiushi Wu <wu000273@umn.edu>

[ Upstream commit 7cc31613734c4870ae32f5265d576ef296621343 ]

kobject_init_and_add() takes reference even when it fails.
Thus, when kobject_init_and_add() returns an error,
kobject_put() must be called to properly clean up the kobject.

Fixes: d72e31c93746 ("iommu: IOMMU Groups")
Signed-off-by: Qiushi Wu <wu000273@umn.edu>
Link: https://lore.kernel.org/r/20200527210020.6522-1-wu000273@umn.edu
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -206,7 +206,7 @@  again:
 		mutex_lock(&iommu_group_mutex);
 		ida_remove(&iommu_group_ida, group->id);
 		mutex_unlock(&iommu_group_mutex);
-		kfree(group);
+		kobject_put(&group->kobj);
 		return ERR_PTR(ret);
 	}