Hi,
On 1/11/21 3:46 PM, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> The left shift of int 32 bit integer constant 1 is evaluated using 32 bit
> arithmetic and then passed as a 64 bit function argument. In the case where
> func is 32 or more this can lead to an oveflow. Avoid this by shifting
> using the BIT_ULL macro instead.
>
> Addresses-Coverity: ("Unintentional integer overflow")
> Fixes: fc00bc8ac1da ("platform/surface: Add Surface ACPI Notify driver")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Thank you for your patch, I've applied this patch to my review-hans
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans
Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.
Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.
Regards,
Hans
> ---
> drivers/platform/surface/surface_acpi_notify.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/platform/surface/surface_acpi_notify.c b/drivers/platform/surface/surface_acpi_notify.c
> index 8cd67a669c86..ef9c1f8e8336 100644
> --- a/drivers/platform/surface/surface_acpi_notify.c
> +++ b/drivers/platform/surface/surface_acpi_notify.c
> @@ -188,7 +188,7 @@ static int san_acpi_notify_event(struct device *dev, u64 func,
> union acpi_object *obj;
> int status = 0;
>
> - if (!acpi_check_dsm(san, &SAN_DSM_UUID, SAN_DSM_REVISION, 1 << func))
> + if (!acpi_check_dsm(san, &SAN_DSM_UUID, SAN_DSM_REVISION, BIT_ULL(func)))
> return 0;
>
> dev_dbg(dev, "notify event %#04llx\n", func);
>
