[PATCH] iommu: check if group is NULL before remove device

From: Frank Wunderlich
Date: Thu Jul 15 2021 - 03:12:07 EST


From: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>

if probe is failing, iommu_group may be not initialized,
so freeing it will result in NULL pointer access

Fixes: d72e31c93746 ("iommu: IOMMU Groups")
Signed-off-by: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
---
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