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From: Frank Wunderlich <linux@fw-web.de>
To: iommu@lists.linux-foundation.org
Cc: Frank Wunderlich <frank-w@public-files.de>,
	Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org, yong.wu@mediatek.com
Subject: [PATCH v2] iommu: Check if group is NULL before remove device
Date: Sat, 31 Jul 2021 09:47:37 +0200	[thread overview]
Message-ID: <20210731074737.4573-1-linux@fw-web.de> (raw)

From: Frank Wunderlich <frank-w@public-files.de>

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>
---
v2:
- commit-message with captial letters on beginning of sentenence
- added more information, many thanks to Yong Wu
---
 drivers/iommu/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5419c4b9f27a..63f0af10c403 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -924,6 +924,9 @@ 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. */
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Frank Wunderlich <linux@fw-web.de>
To: iommu@lists.linux-foundation.org
Cc: Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org,
	Frank Wunderlich <frank-w@public-files.de>
Subject: [PATCH v2] iommu: Check if group is NULL before remove device
Date: Sat, 31 Jul 2021 09:47:37 +0200	[thread overview]
Message-ID: <20210731074737.4573-1-linux@fw-web.de> (raw)

From: Frank Wunderlich <frank-w@public-files.de>

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>
---
v2:
- commit-message with captial letters on beginning of sentenence
- added more information, many thanks to Yong Wu
---
 drivers/iommu/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5419c4b9f27a..63f0af10c403 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -924,6 +924,9 @@ 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. */
-- 
2.25.1

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

             reply	other threads:[~2021-07-31  7:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-31  7:47 Frank Wunderlich [this message]
2021-07-31  7:47 ` [PATCH v2] iommu: Check if group is NULL before remove device Frank Wunderlich
2021-08-02 14:23 ` Joerg Roedel
2021-08-02 14:23   ` Joerg Roedel

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