linux-kernel - Re: [PATCH 5.10 045/152] dm crypt: use GFP_ATOMIC when allocating crypto requests from softirq

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Date:   Mon, 18 Jan 2021 23:44:32 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        Ignat Korchagin <ignat@...udflare.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH 5.10 045/152] dm crypt: use GFP_ATOMIC when allocating
 crypto requests from softirq


> Fix this by allocating crypto requests with GFP_ATOMIC mask in
> interrupt context.
...

This one is wrong.


> +++ b/drivers/md/dm-crypt.c
> @@ -1454,13 +1454,16 @@ static int crypt_convert_block_skcipher(
> -	if (!ctx->r.req)
> -		ctx->r.req = mempool_alloc(&cc->req_pool, GFP_NOIO);
> +	if (!ctx->r.req) {
> +		ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);

Good so far. Ugly but good.

> -static void crypt_alloc_req_aead(struct crypt_config *cc,
> +static int crypt_alloc_req_aead(struct crypt_config *cc,
>  				 struct convert_context *ctx)
>  {
> -	if (!ctx->r.req_aead)
> -		ctx->r.req_aead = mempool_alloc(&cc->req_pool, GFP_NOIO);
> +	if (!ctx->r.req) {
> +		ctx->r.req = mempool_alloc(&cc->req_pool, in_interrupt() ? GFP_ATOMIC : GFP_NOIO);
> +		if (!ctx->r.req)
> +			return -ENOMEM;
> +	}

But this one can't be good. We are now allocating different field in
the structure!

								Pavel

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