linux-kernel - Re: [PATCH] crypto: chacha20poly1305 - Annotate struct chachapoly_ctx with __counted

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Message-ID: <20240805175932.GB1564@sol.localdomain>
Date: Mon, 5 Aug 2024 10:59:32 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: Thorsten Blum <thorsten.blum@...lux.com>
Cc: herbert@...dor.apana.org.au, davem@...emloft.net, kees@...nel.org,
	gustavoars@...nel.org, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] crypto: chacha20poly1305 - Annotate struct
 chachapoly_ctx with __counted_by()

On Mon, Aug 05, 2024 at 07:52:38PM +0200, Thorsten Blum wrote:
>  struct poly_req {
> @@ -611,8 +611,8 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
>  				       poly->base.cra_priority) / 2;
>  	inst->alg.base.cra_blocksize = 1;
>  	inst->alg.base.cra_alignmask = chacha->base.cra_alignmask;
> -	inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) +
> -				     ctx->saltlen;
> +	inst->alg.base.cra_ctxsize = struct_size_t(struct chachapoly_ctx, salt,
> +						   ctx->saltlen);

What was wrong with the more straightforward code it had before?

- Eric