linux-kernel - Re: [PATCH] arm64: extable: fix null deref in load_unaligned

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Message-ID: <Ye53tbiEt9Z1Jf9/@arm.com>
Date:   Mon, 24 Jan 2022 09:56:05 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Evgenii Stepanov <eugenis@...gle.com>
Cc:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: extable: fix null deref in load_unaligned_zeropad.

On Fri, Jan 21, 2022 at 06:34:47PM -0800, Evgenii Stepanov wrote:
> ex_handler_load_unaligned_zeropad extracts the source and data register
> numbers from the wrong field of the exception table.

Could you please also include the stack dump if you get one from the
null pointer dereference?

> Fixes: 753b3236

This should be expanded:

Fixes: 753b32368705 ("arm64: extable: add load_unaligned_zeropad() handler")
Cc: <stable@...r.kernel.org> # 5.16.x

Thanks.

-- 
Catalin