linux-kernel - Re: [PATCH v5 1/2] lib/mpi: Fix buffer overrun when SG is too long

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Message-ID: <Y64W4BqHbA+lf/8v@sol.localdomain>
Date:   Thu, 29 Dec 2022 14:38:24 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>
Cc:     dhowells@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, zohar@...ux.ibm.com,
        dmitry.kasatkin@...il.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v5 1/2] lib/mpi: Fix buffer overrun when SG is too long

On Tue, Dec 27, 2022 at 03:27:39PM +0100, Roberto Sassu wrote:
> From: Herbert Xu <herbert@...dor.apana.org.au>
> 
> The helper mpi_read_raw_from_sgl sets the number of entries in
> the SG list according to nbytes.  However, if the last entry
> in the SG list contains more data than nbytes, then it may overrun
> the buffer because it only allocates enough memory for nbytes.
> 
> Fixes: 2d4d1eea540b ("lib/mpi: Add mpi sgl helpers")
> Reported-by: Roberto Sassu <roberto.sassu@...weicloud.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> ---
>  lib/mpi/mpicoder.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Eric Biggers <ebiggers@...gle.com>

- Eric