linux-kernel - Re: [PATCH v2] arm64: acpi: fix UBSAN warning

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Message-Id: <159178566875.41592.7975510364023488303.b4-ty@kernel.org>
Date:   Wed, 10 Jun 2020 12:21:08 +0100
From:   Will Deacon <will@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Enrico Weigelt <info@...ux.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Allison Randal <allison@...utok.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jeremy Linton <jeremy.linton@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] arm64: acpi: fix UBSAN warning

On Mon, 8 Jun 2020 13:38:17 -0700, Nick Desaulniers wrote:
> Will reported a UBSAN warning:
> 
> UBSAN: null-ptr-deref in arch/arm64/kernel/smp.c:596:6
> member access within null pointer of type 'struct acpi_madt_generic_interrupt'
> CPU: 0 PID: 0 Comm: swapper Not tainted 5.7.0-rc6-00124-g96bc42ff0a82 #1
> Call trace:
>  dump_backtrace+0x0/0x384
>  show_stack+0x28/0x38
>  dump_stack+0xec/0x174
>  handle_null_ptr_deref+0x134/0x174
>  __ubsan_handle_type_mismatch_v1+0x84/0xa4
>  acpi_parse_gic_cpu_interface+0x60/0xe8
>  acpi_parse_entries_array+0x288/0x498
>  acpi_table_parse_entries_array+0x178/0x1b4
>  acpi_table_parse_madt+0xa4/0x110
>  acpi_parse_and_init_cpus+0x38/0x100
>  smp_init_cpus+0x74/0x258
>  setup_arch+0x350/0x3ec
>  start_kernel+0x98/0x6f4
> 
> [...]

Applied to arm64 (for-next/core), thanks!

[1/1] arm64: acpi: fix UBSAN warning
      https://git.kernel.org/arm64/c/a194c33f45f8

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev