linux-kernel - Re: [PATCH 1/4] hfsplus: Unmap the page in the "fail

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Message-Id: <4F9CF812-32DB-4A2F-B81A-D5382039FD56@dubeyko.com>
Date:   Tue, 9 Aug 2022 15:16:29 -0700
From:   Viacheslav Dubeyko <slava@...eyko.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Ira Weiny <ira.weiny@...el.com>, Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bart Van Assche <bvanassche@....org>,
        Kees Cook <keescook@...omium.org>,
        Muchun Song <songmuchun@...edance.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] hfsplus: Unmap the page in the "fail_page" label



> On Aug 9, 2022, at 1:31 PM, Fabio M. De Francesco <fmdefrancesco@...il.com> wrote:
> 
> Several paths within hfs_btree_open() jump to the "fail_page" label
> where put_page() is called while the page is still mapped.
> 
> Call kunmap() to unmap the page soon before put_page().
> 
> Cc: Viacheslav Dubeyko <slava@...eyko.com>
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
> fs/hfsplus/btree.c | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
> index 66774f4cb4fd..3a917a9a4edd 100644
> --- a/fs/hfsplus/btree.c
> +++ b/fs/hfsplus/btree.c
> @@ -245,6 +245,7 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
> 	return tree;
> 
>  fail_page:
> +	kunmap(page);
> 	put_page(page);
>  free_inode:
> 	tree->inode->i_mapping->a_ops = &hfsplus_aops;
> -- 
> 2.37.1
> 

Looks good.

Reviewed-by: Viacheslav Dubeyko <slava@...eyko.com>

Thanks,
Slava.