linux-kernel - Re: [PATCH] fs/ntfs3: Fix memory leak on ntfs_fill

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Date:   Thu, 08 Sep 2022 01:01:32 +0900 (JST)
From:   Shigeru Yoshida <syoshida@...hat.com>
To:     almaz.alexandrovich@...agon-software.com
Cc:     ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        syoshida@...hat.com,
        syzbot+9d67170b20e8f94351c8@...kaller.appspotmail.com
Subject: Re: [PATCH] fs/ntfs3: Fix memory leak on ntfs_fill_super() error
 path

ping?

On Tue, 23 Aug 2022 19:32:05 +0900, Shigeru Yoshida wrote:
> syzbot reported kmemleak as below:
> 
> BUG: memory leak
> unreferenced object 0xffff8880122f1540 (size 32):
>   comm "a.out", pid 6664, jiffies 4294939771 (age 25.500s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 ed ff ed ff 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81b16052>] ntfs_init_fs_context+0x22/0x1c0
>     [<ffffffff8164aaa7>] alloc_fs_context+0x217/0x430
>     [<ffffffff81626dd4>] path_mount+0x704/0x1080
>     [<ffffffff81627e7c>] __x64_sys_mount+0x18c/0x1d0
>     [<ffffffff84593e14>] do_syscall_64+0x34/0xb0
>     [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> This patch fixes this issue by freeing mount options on error path of
> ntfs_fill_super().
> 
> Reported-by: syzbot+9d67170b20e8f94351c8@...kaller.appspotmail.com
> Signed-off-by: Shigeru Yoshida <syoshida@...hat.com>
> ---
>  fs/ntfs3/super.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> index 47012c9bf505..c0e45f170701 100644
> --- a/fs/ntfs3/super.c
> +++ b/fs/ntfs3/super.c
> @@ -1281,6 +1281,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
>  	 * Free resources here.
>  	 * ntfs_fs_free will be called with fc->s_fs_info = NULL
>  	 */
> +	put_mount_options(sbi->options);
>  	put_ntfs(sbi);
>  	sb->s_fs_info = NULL;
>  
> -- 
> 2.37.2
>