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Date:   Fri, 3 Nov 2017 21:43:07 +0800
From:   Herbert Xu <>
To:     Romain Izard <>
Cc:     "David S . Miller" <>,
        Tudor Ambarus <>,,
Subject: Re: [PATCH] crypto: ccm - preserve the IV buffer

On Tue, Oct 31, 2017 at 03:42:35PM +0100, Romain Izard wrote:
> The IV buffer used during CCM operations is used twice, during both the
> hashing step and the ciphering step.
> When using a hardware accelerator that updates the contents of the IV
> buffer at the end of ciphering operations, the value will be modified.
> In the decryption case, the subsequent setup of the hashing algorithm
> will interpret the updated IV instead of the original value, which can
> lead to out-of-bounds writes.
> Reuse the idata buffer, only used in the hashing step, to preserve the
> IV's value during the ciphering step in the decryption case.
> Signed-off-by: Romain Izard <>

Patch applied.  Thanks.
Email: Herbert Xu <>
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