WSL2-Linux-Kernel/drivers/acpi/apei
Ashish Kalra 43d2748394 ACPI: APEI: Fix integer overflow in ghes_estatus_pool_init()
Change num_ghes from int to unsigned int, preventing an overflow
and causing subsequent vmalloc() to fail.

The overflow happens in 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@amd.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-10-13 20:40:09 +02:00
..
Kconfig
Makefile
apei-base.c ACPI: APEI: Remove unneeded result variables 2022-09-24 18:50:42 +02:00
apei-internal.h
bert.c ACPI: APEI: Add BERT error log footer 2022-09-03 20:25:39 +02:00
einj.c ACPI: APEI: Fix _EINJ vs EFI_MEMORY_SP 2022-06-29 20:24:19 +02:00
erst-dbg.c ACPI: APEI: Fix missing ERST record id 2022-04-13 20:29:24 +02:00
erst.c ACPI: APEI: Remove unneeded result variables 2022-09-24 18:50:42 +02:00
ghes.c ACPI: APEI: Fix integer overflow in ghes_estatus_pool_init() 2022-10-13 20:40:09 +02:00
hest.c ACPI: APEI: fix return value of __setup handlers 2022-03-08 19:43:39 +01:00