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

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Message-ID: <20221005154105.454809-1-Ashish.Kalra@amd.com>
Date:   Wed, 5 Oct 2022 15:41:05 +0000
From:   Ashish Kalra <Ashish.Kalra@....com>
To:     <ashish.kalra@....com>
CC:     <bp@...en8.de>, <devel@...ica.org>, <james.morse@....com>,
        <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <rafael@...nel.org>,
        <robert.moore@...el.com>, <tony.luck@...el.com>
Subject: [PATCH] ACPI: APEI: Fix num_ghes to unsigned int

Yes, on one of our AMD EPYC processors, num_ghes is 32776 and we get the following call trace due to vmalloc() failure beacuse of the overflow:

[    9.317108] swapper/0: vmalloc error: size 18446744071562596352, exceeds total pages, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0-1
[    9.317125] CPU: 256 PID: 1 Comm: swapper/0 Not tainted 5.19.0-rc6-snp-host-61a51248451b #1
[    9.317129] Hardware name: AMD Corporation QUARTZ/QUARTZ, BIOS TQZ1002E 09/28/2022
[    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>

Thanks,
Ashish