On Thu, Dec 1, 2022 at 8:00 AM Li Zetao <lizetao1@xxxxxxxxxx> wrote:
>
> There is an use-after-free reported by KASAN:
>
> BUG: KASAN: use-after-free in acpi_ut_remove_reference+0x3b/0x82
> Read of size 1 at addr ffff888112afc460 by task modprobe/2111
> CPU: 0 PID: 2111 Comm: modprobe Not tainted 6.1.0-rc7-dirty
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> Call Trace:
> <TASK>
> kasan_report+0xae/0xe0
> acpi_ut_remove_reference+0x3b/0x82
> acpi_ut_copy_iobject_to_iobject+0x3be/0x3d5
> acpi_ds_store_object_to_local+0x15d/0x3a0
> acpi_ex_store+0x78d/0x7fd
> acpi_ex_opcode_1A_1T_1R+0xbe4/0xf9b
> acpi_ps_parse_aml+0x217/0x8d5
> ...
> </TASK>
>
> The root cause of the problem is that the acpi_operand_object
> is freed when acpi_ut_walk_package_tree() fails in
> acpi_ut_copy_ipackage_to_ipackage(), lead to repeated release in
> acpi_ut_copy_iobject_to_iobject(). The problem was introduced
> by "8aa5e56eeb61" commit, this commit is to fix memory leak in
> acpi_ut_copy_iobject_to_iobject(), repeatedly adding remove
> operation, lead to "acpi_operand_object" used after free.
>
> Fix it by removing acpi_ut_remove_reference() in
> acpi_ut_copy_ipackage_to_ipackage(). acpi_ut_copy_ipackage_to_ipackage()
> is called to copy an internal package object into another internal
> package object, when it fails, the memory of acpi_operand_object
> should be freed by the caller.
>
> Fixes: 8aa5e56eeb61 ("ACPICA: Utilities: Fix memory leak in acpi_ut_copy_iobject_to_iobject")
> Signed-off-by: Li Zetao <lizetao1@xxxxxxxxxx>
> ---
> drivers/acpi/acpica/utcopy.c | 7 -------
> 1 file changed, 7 deletions(-)
>
> diff --git a/drivers/acpi/acpica/utcopy.c b/drivers/acpi/acpica/utcopy.c
> index 400b9e15a709..63c17f420fb8 100644
> --- a/drivers/acpi/acpica/utcopy.c
> +++ b/drivers/acpi/acpica/utcopy.c
> @@ -916,13 +916,6 @@ acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
> status = acpi_ut_walk_package_tree(source_obj, dest_obj,
> acpi_ut_copy_ielement_to_ielement,
> walk_state);
> - if (ACPI_FAILURE(status)) {
> -
> - /* On failure, delete the destination package object */
> -
> - acpi_ut_remove_reference(dest_obj);
> - }
> -
> return_ACPI_STATUS(status);
> }
>
> --
Applied as 6.2 material.
Normally, I would ask for a corresponding pull request to be submitted
to the upstream project on GitHub, but this looks serious enough to be
fast-tracked.
Anyway, it would help if you submitted a pull request with this change
to upstream ACPICA on GitHub. Otherwise, I'll take care of that.
