linux-ext4 - Re: [PATCH 1/3] jbd2: fix potential double free

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Message-ID: <a931ed92-763c-0a18-ed3d-4ac1c4fbcb8d@oracle.com>
Date:   Wed, 8 May 2019 14:38:22 +0800
From:   "sunny.s.zhang" <sunny.s.zhang@...cle.com>
To:     Chengguang Xu <cgxu519@...il.com>, jack@...e.com, tytso@....edu
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] jbd2: fix potential double free

Hi Chengguang,

在 2019年05月05日 19:01, Chengguang Xu 写道:
> When fail from creating cache jbd2_inode_cache, we will
> destroy previously created cache jbd2_handle_cache twice.
> This patch fixes it by removing first destroy in error path.
>
> Signed-off-by: Chengguang Xu <cgxu519@...il.com>
> ---
>   fs/jbd2/journal.c | 1 -
>   1 file changed, 1 deletion(-)
>
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 382c030cc78b..49797854ccb8 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -2642,7 +2642,6 @@ static int __init jbd2_journal_init_handle_cache(void)
>   	jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0);
>   	if (jbd2_inode_cache == NULL) {
>   		printk(KERN_EMERG "JBD2: failed to create inode cache\n");
> -		kmem_cache_destroy(jbd2_handle_cache);
Maybe we should keep it, and set the jbd2_handle_cache to NULL.
If there are some changes in the future,  we may forget to change the 
function
of jbd2_journal_destroy_handle_cache.

Thanks,
Sunny

>   		return -ENOMEM;
>   	}
>   	return 0;