linux-kernel - Re: [PATCH] crypto: cavium/nitrox - remove check of list iterator against head past the loop body

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Message-ID: <Yk/zDVxvgyepUKwX@gondor.apana.org.au>
Date:   Fri, 8 Apr 2022 16:32:13 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Jakob Koschel <jakobkoschel@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Amey Narkhede <ameynarkhede03@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Lee Jones <lee.jones@...aro.org>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...nel.org>,
        Brian Johannesmeyer <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>
Subject: Re: [PATCH] crypto: cavium/nitrox - remove check of list iterator
 against head past the loop body

On Thu, Mar 31, 2022 at 11:59:10PM +0200, Jakob Koschel wrote:
> When list_for_each_entry() completes the iteration over the whole list
> without breaking the loop, the iterator value will be a bogus pointer
> computed based on the head element.
> 
> While it is safe to use the pointer to determine if it was computed
> based on the head element, either with list_entry_is_head() or
> &pos->member == head, using the iterator variable after the loop should
> be avoided.
> 
> In preparation to limit the scope of a list iterator to the list
> traversal loop, use a dedicated pointer to point to the found element [1].
> 
> Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
> Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
> ---
>  drivers/crypto/cavium/nitrox/nitrox_main.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt