linux-kernel - [PATCH 4.4 24/48] iommu: Fix reference count leak in iommu_group

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Message-Id: <20200601173959.379801531@linuxfoundation.org>
Date:   Mon,  1 Jun 2020 19:53:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qiushi Wu <wu000273@....edu>,
        Joerg Roedel <jroedel@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 24/48] iommu: Fix reference count leak in iommu_group_alloc.

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

--- 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);
 	}