linux-kernel - Re: [PATCH 10/29] drivers, md: convert stripe_head.count from atomic_t to refcount

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Message-ID: <20170307190759.jnrq66kfpkr4m7zl@kernel.org>
Date:   Tue, 7 Mar 2017 11:07:59 -0800
From:   Shaohua Li <shli@...nel.org>
To:     Elena Reshetova <elena.reshetova@...el.com>
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux1394-devel@...ts.sourceforge.net,
        linux-bcache@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...uxdriverproject.org,
        linux-pci@...r.kernel.org, linux-s390@...r.kernel.org,
        fcoe-devel@...n-fcoe.org, linux-scsi@...r.kernel.org,
        open-iscsi@...glegroups.com, devel@...verdev.osuosl.org,
        target-devel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-usb@...r.kernel.org, peterz@...radead.org,
        Hans Liljestrand <ishkamiel@...il.com>,
        Kees Cook <keescook@...omium.org>,
        David Windsor <dwindsor@...il.com>
Subject: Re: [PATCH 10/29] drivers, md: convert stripe_head.count from
 atomic_t to refcount_t

On Mon, Mar 06, 2017 at 04:20:57PM +0200, Elena Reshetova wrote:
> refcount_t type and corresponding API should be
> used instead of atomic_t when the variable is used as
> a reference counter. This allows to avoid accidental
> refcounter overflows that might lead to use-after-free
> situations.
> 
> Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
> Signed-off-by: Hans Liljestrand <ishkamiel@...il.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: David Windsor <dwindsor@...il.com>
> ---
>  drivers/md/raid5-cache.c |  8 +++---
>  drivers/md/raid5.c       | 66 ++++++++++++++++++++++++------------------------
>  drivers/md/raid5.h       |  3 ++-
>  3 files changed, 39 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
> index 3f307be..6c05e12 100644
> --- a/drivers/md/raid5-cache.c
> +++ b/drivers/md/raid5-cache.c

snip
>  	       sh->check_state, sh->reconstruct_state);
>  
>  	analyse_stripe(sh, &s);
> @@ -4924,7 +4924,7 @@ static void activate_bit_delay(struct r5conf *conf,
>  		struct stripe_head *sh = list_entry(head.next, struct stripe_head, lru);
>  		int hash;
>  		list_del_init(&sh->lru);
> -		atomic_inc(&sh->count);
> +		refcount_inc(&sh->count);
>  		hash = sh->hash_lock_index;
>  		__release_stripe(conf, sh, &temp_inactive_list[hash]);
>  	}
> @@ -5240,7 +5240,7 @@ static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group)
>  		sh->group = NULL;
>  	}
>  	list_del_init(&sh->lru);
> -	BUG_ON(atomic_inc_return(&sh->count) != 1);
> +	BUG_ON(refcount_inc_not_zero(&sh->count));

This changes the behavior. refcount_inc_not_zero doesn't inc if original value is 0

Thanks,
Shaohua