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SubjectRe: [PATCH][next] acpi/hmat: fix uninitialized pointer dereference on pointer 'target'
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On 4/5/2019 7:42 PM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> The pointer 'target' is not initialized and is only assigned when the
> ACPI_HMAT_MEMORY_PD_VALID bit in p->flags is set. There is a later null
> check on target that leads to an uninitialized pointer read and
> dereference when assigning target->processor_pxm when target contains a
> non-null garbage value. Fix this by initializing targer to null.
>
> Fixes: 665ac7e92757 ("acpi/hmat: Register processor domain to its memory")
> Addresses-Coverity: ("Uninitialized pointer read")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

Cheers,
-Mukesh
> ---
> drivers/acpi/hmat/hmat.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c
> index b7824a0309f7..b275016ff648 100644
> --- a/drivers/acpi/hmat/hmat.c
> +++ b/drivers/acpi/hmat/hmat.c
> @@ -366,7 +366,7 @@ static int __init hmat_parse_proximity_domain(union acpi_subtable_headers *heade
> const unsigned long end)
> {
> struct acpi_hmat_proximity_domain *p = (void *)header;
> - struct memory_target *target;
> + struct memory_target *target = NULL;
>
> if (p->header.length != sizeof(*p)) {
> pr_notice("HMAT: Unexpected address range header length: %d\n",

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