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Date:   Thu, 29 Dec 2022 14:38:24 -0800
From:   Eric Biggers <ebiggers@kernel.org>
To:     Roberto Sassu <roberto.sassu@huaweicloud.com>
Cc:     dhowells@redhat.com, herbert@gondor.apana.org.au,
        davem@davemloft.net, zohar@linux.ibm.com,
        dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org,
        serge@hallyn.com, linux-integrity@vger.kernel.org,
        linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org
Subject: Re: [PATCH v5 1/2] lib/mpi: Fix buffer overrun when SG is too long
Message-ID: <Y64W4BqHbA+lf/8v@sol.localdomain>
References: <20221227142740.2807136-1-roberto.sassu@huaweicloud.com>
 <20221227142740.2807136-2-roberto.sassu@huaweicloud.com>
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On Tue, Dec 27, 2022 at 03:27:39PM +0100, Roberto Sassu wrote:
> From: Herbert Xu <herbert@gondor.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@huaweicloud.com>
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
> ---
>  lib/mpi/mpicoder.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

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

- Eric