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From: Ard Biesheuvel <ardb@kernel.org>
To: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
	Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	syzbot+20191dc583eff8602d2d@syzkaller.appspotmail.com
Subject: Re: [PATCH] crypto: xts_crypt() return if walk.nbytes is 0
Date: Tue, 17 Aug 2021 16:18:53 +0200	[thread overview]
Message-ID: <CAMj1kXGjY-EfaLc47HKvFz8AKeT=+XTXNRR5kVbQV7s3Hi9C2g@mail.gmail.com> (raw)
In-Reply-To: <20210809141027.860850-1-chouhan.shreyansh630@gmail.com>

On Mon, 9 Aug 2021 at 16:10, Shreyansh Chouhan
<chouhan.shreyansh630@gmail.com> wrote:
>
> xts_crypt() code doesn't call kernel_fpu_end() after calling
> kernel_fpu_begin() if walk.nbytes is 0. The correct behavior should be
> not calling kernel_fpu_begin() if walk.nbytes is 0.
>
> Reported-by: syzbot+20191dc583eff8602d2d@syzkaller.appspotmail.com
> Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>

Acked-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>  arch/x86/crypto/aesni-intel_glue.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
> index 388643ca2177..ec6eac57c493 100644
> --- a/arch/x86/crypto/aesni-intel_glue.c
> +++ b/arch/x86/crypto/aesni-intel_glue.c
> @@ -849,7 +849,7 @@ static int xts_crypt(struct skcipher_request *req, bool encrypt)
>                 return -EINVAL;
>
>         err = skcipher_walk_virt(&walk, req, false);
> -       if (err)
> +       if (err || !walk.nbytes)
>                 return err;
>
>         if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
> --
> 2.31.1
>

  reply	other threads:[~2021-08-17 14:19 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 13:41 [PATCH] crypto: add missing kernel_fpu_end() call Shreyansh Chouhan
2021-08-06  8:23 ` Herbert Xu
2021-08-06  9:05   ` Ard Biesheuvel
2021-08-06  9:07     ` Ard Biesheuvel
2021-08-06 10:36       ` Shreyansh Chouhan
2021-08-09 14:10         ` [PATCH] crypto: xts_crypt() return if walk.nbytes is 0 Shreyansh Chouhan
2021-08-17 14:18           ` Ard Biesheuvel [this message]
2021-08-20  8:31           ` Herbert Xu
2021-08-20 11:14             ` Ard Biesheuvel
2021-08-20 12:53               ` Herbert Xu
2021-08-22  3:45                 ` [PATCH v2] " Shreyansh Chouhan
2021-08-27  8:38                   ` Herbert Xu
2021-08-22  3:48                 ` [PATCH] " Shreyansh Chouhan
2021-08-22 13:23                 ` Ard Biesheuvel

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