linux-kernel - Re: [PATCH] pstore: skip zero size persistent ram buffer in traverse

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Date:	Sun, 02 Mar 2014 17:06:03 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	shuox.liu@...el.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
CC:	tony.luck@...el.com, keescook@...omium.org, ccross@...roid.com,
	anton@...msg.org
Subject: Re: [PATCH] pstore: skip zero size persistent ram buffer in traverse

On 2014/2/28 14:38, shuox.liu@...el.com wrote:
> From: Liu ShuoX <shuox.liu@...el.com>
>
> In ramoops_pstore_read, a valid prz pointer with zero size buffer will
> break traverse of all persistent ram buffers. The latter buffer might
> be lost.

Andrew,

Would you like to merge it to your testing tree?
pstore is a very important feature for debugging hard issues on
Android mobiles.

Yanmin

>
> Signed-off-by: Liu ShuoX <shuox.liu@...el.com>
> ---
>   fs/pstore/ram.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
> index a5d0cab..929ea55 100644
> --- a/fs/pstore/ram.c
> +++ b/fs/pstore/ram.c
> @@ -119,12 +119,12 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
>   
>   	prz = przs[i];
>   
> -	if (update) {
> -		/* Update old/shadowed buffer. */
> +	/* Update old/shadowed buffer. */
> +	if (update)
>   		persistent_ram_save_old(prz);
> -		if (!persistent_ram_old_size(prz))
> -			return NULL;
> -	}
> +
> +	if (!persistent_ram_old_size(prz))
> +		return NULL;
>   
>   	*typep = type;
>   	*id = i;

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