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

Kai-Heng Feng kai.heng.feng at canonical.com
Tue Jul 9 11:11:33 UTC 2019

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

NULL pointer dereference in acpi_quirk_matches_bios_ids() renders kernel

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.

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

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


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