On Wed, Oct 5, 2022 at 6:33 PM Ashish Kalra <Ashish.Kalra@xxxxxxx> wrote:
>
> From: Ashish Kalra <ashish.kalra@xxxxxxx>
>
> Change num_ghes from int to unsigned int, preventing an overflow
> and causing subsequent vmalloc to fail.
>
> The overflow happens in the ghes_estatus_pool_init() when calculating
> len during execution of the statement below as both multiplication
> operands here are signed int :
>
> len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
>
> The following call trace is observed because of this bug:
>
> [ 9.317108] swapper/0: vmalloc error: size 18446744071562596352, exceeds total pages, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0-1
> [ 9.317131] Call Trace:
> [ 9.317134] <TASK>
> [ 9.317137] dump_stack_lvl+0x49/0x5f
> [ 9.317145] dump_stack+0x10/0x12
> [ 9.317146] warn_alloc.cold+0x7b/0xdf
> [ 9.317150] ? __device_attach+0x16a/0x1b0
> [ 9.317155] __vmalloc_node_range+0x702/0x740
> [ 9.317160] ? device_add+0x17f/0x920
> [ 9.317164] ? dev_set_name+0x53/0x70
> [ 9.317166] ? platform_device_add+0xf9/0x240
> [ 9.317168] __vmalloc_node+0x49/0x50
> [ 9.317170] ? ghes_estatus_pool_init+0x43/0xa0
> [ 9.317176] vmalloc+0x21/0x30
> [ 9.317177] ghes_estatus_pool_init+0x43/0xa0
> [ 9.317179] acpi_hest_init+0x129/0x19c
> [ 9.317185] acpi_init+0x434/0x4a4
> [ 9.317188] ? acpi_sleep_proc_init+0x2a/0x2a
> [ 9.317190] do_one_initcall+0x48/0x200
> [ 9.317195] kernel_init_freeable+0x221/0x284
> [ 9.317200] ? rest_init+0xe0/0xe0
> [ 9.317204] kernel_init+0x1a/0x130
> [ 9.317205] ret_from_fork+0x22/0x30
> [ 9.317208] </TASK>
>
> Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
> ---
> drivers/acpi/apei/ghes.c | 2 +-
> include/acpi/ghes.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index d91ad378c00d..6d7c202142a6 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -163,7 +163,7 @@ static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
> clear_fixmap(fixmap_idx);
> }
>
> -int ghes_estatus_pool_init(int num_ghes)
> +int ghes_estatus_pool_init(unsigned int num_ghes)
> {
> unsigned long addr, len;
> int rc;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 34fb3431a8f3..292a5c40bd0c 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -71,7 +71,7 @@ int ghes_register_vendor_record_notifier(struct notifier_block *nb);
> void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
> #endif
>
> -int ghes_estatus_pool_init(int num_ghes);
> +int ghes_estatus_pool_init(unsigned int num_ghes);
>
> /* From drivers/edac/ghes_edac.c */
>
> --
Applied as 6.1 material with some edits in the subject and changelog.
Thanks!
