linux-kernel - [PATCH v2] ACPI: APEI: Fix num

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Date:   Wed, 5 Oct 2022 16:32:53 +0000
From:   Ashish Kalra <Ashish.Kalra@....com>
To:     <rafael@...nel.org>, <lenb@...nel.org>, <james.morse@....com>,
        <tony.luck@...el.com>, <bp@...en8.de>, <robert.moore@...el.com>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devel@...ica.org>
Subject: [PATCH v2] ACPI: APEI: Fix num_ghes to unsigned int

From: Ashish Kalra <ashish.kalra@....com>

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@....com>
---
 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 */
 
-- 
2.25.1