From: Mario Limonciello <mario.limonciello@xxxxxxxx>
When we walk up the device hierarchy in tb_acpi_add_link() make sure we
break the loop if the device has no parent. Otherwise we may crash the
kernel by dereferencing a NULL pointer.
Fixes: b2be2b05cf3b ("thunderbolt: Create device links from ACPI description")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
drivers/thunderbolt/acpi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/thunderbolt/acpi.c b/drivers/thunderbolt/acpi.c
index a5f988a9f948..b5442f979b4d 100644
--- a/drivers/thunderbolt/acpi.c
+++ b/drivers/thunderbolt/acpi.c
@@ -56,7 +56,7 @@ static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data,
* managed with the xHCI and the SuperSpeed hub so we create the
* link from xHCI instead.
*/
- while (!dev_is_pci(dev))
+ while (dev && !dev_is_pci(dev))
dev = dev->parent;
if (!dev)
--
2.29.2
