[SRU] [Bionic] [PATCH 0/1] Fix unbootable kernel inside VMs

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1829378

[Impact]
NULL pointer dereference in acpi_quirk_matches_bios_ids() renders kernel
unbootable.

[Fix]
It's a regression caused by commit abd273f52766 ("UBUNTU: SAUCE: ACPI /
bus: Add some Lenovo laptops in list of acpi table term list").

When both bios_vendor and bios_ver are NULL then a NULL string is passed
to strncmp() and the issue occurs.

VMs may not provides string bios_vendor or bios_ver, so bail out early
when either bios_vendor or bios_ver is NULL.

[Test]
User reported the test kernel with proposed fix solves the issue.

[Regression Potenial]
Low. It's quite trivial so I don't think it'll regress anything.

Kai-Heng Feng (1):
  UBUNTU: SAUCE: ACPI / bus: Fix NULL pointer dereference in
    acpi_quirk_matches_bios_ids()

 drivers/acpi/bus.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

-- 
2.17.1