On 9/24/21 11:10 AM, Rafael J. Wysocki wrote:
On Thu, Sep 16, 2021 at 9:50 PM Mark Langsdorf <mlangsdo@xxxxxxxxxx> wrote:
If table->serial_port.access_width is more than 29, it causes
undefined behavior when ACPI_ACCESS_BIT_WIDTH shifts it to
(1 << ((size) + 2)):
[ 0.000000] UBSAN: Undefined behaviour in drivers/acpi/spcr.c:114:11
[ 0.000000] shift exponent 102 is too large for 32-bit type 'int'
Test that serial_port.access_width is less than 30 and set it to 6
if it is not.
This consists of a Linux part and an ACPICA part (the changes in
actypes.h). The ACPICA part needs to be submitted to the upstream
project before applying this.
Thanks, I wasn't sure of the procedure. I'll get the ACPICA part
accepted and come back with the rest.
--Mark Langsdorf
