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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Frank Wunderlich <frank-w@public-files.de>,
        Joerg Roedel <jroedel@suse.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 25/61] iommu: Check if group is NULL before remove device
Date:   Tue, 24 Aug 2021 13:00:30 -0400
Message-Id: <20210824170106.710221-26-sashal@kernel.org>
In-Reply-To: <20210824170106.710221-1-sashal@kernel.org>
References: <20210824170106.710221-1-sashal@kernel.org>
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From: Frank Wunderlich <frank-w@public-files.de>

[ Upstream commit 5aa95d8834e07907e64937d792c12ffef7fb271f ]

If probe_device is failing, iommu_group is not initialized because
iommu_group_add_device is not reached, so freeing it will result
in NULL pointer access.

iommu_bus_init
  ->bus_iommu_probe
      ->probe_iommu_group in for each:/* return -22 in fail case */
          ->iommu_probe_device
              ->__iommu_probe_device       /* return -22 here.*/
                  -> ops->probe_device          /* return -22 here.*/
                  -> iommu_group_get_for_dev
                        -> ops->device_group
                        -> iommu_group_add_device //good case
  ->remove_iommu_group  //in fail case, it will remove group
     ->iommu_release_device
         ->iommu_group_remove_device // here we don't have group

In my case ops->probe_device (mtk_iommu_probe_device from
mtk_iommu_v1.c) is due to failing fwspec->ops mismatch.

Fixes: d72e31c93746 ("iommu: IOMMU Groups")
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20210731074737.4573-1-linux@fw-web.de
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 9d7232e26ecf..c5758fb696cc 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -775,6 +775,9 @@ void iommu_group_remove_device(struct device *dev)
 	struct iommu_group *group = dev->iommu_group;
 	struct group_device *tmp_device, *device = NULL;
 
+	if (!group)
+		return;
+
 	dev_info(dev, "Removing from iommu group %d\n", group->id);
 
 	/* Pre-notify listeners that a device is being removed. */
-- 
2.30.2