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thunderbolt: Fix possible NULL pointer dereference in tb_acpi_add_link()

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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: b2be2b05cf ("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>
This commit is contained in:
Mario Limonciello 2020-10-26 19:12:59 +03:00 committed by Greg Kroah-Hartman
parent 19155473f3
commit 0e5cb872fb
1 changed files with 1 additions and 1 deletions
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2
drivers/thunderbolt/acpi.c
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@ -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)