From: Mario Limonciello mario.limonciello@dell.com
commit 4d395c5e74398f664405819330e5a298da37f655 upstream.
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@vger.kernel.org Signed-off-by: Mario Limonciello mario.limonciello@dell.com Acked-by: Yehezkel Bernat YehezkelShB@gmail.com Signed-off-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/thunderbolt/acpi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/thunderbolt/acpi.c +++ b/drivers/thunderbolt/acpi.c @@ -56,7 +56,7 @@ static acpi_status tb_acpi_add_link(acpi * 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)