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

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Date:   Fri, 30 Sep 2022 18:51:23 +0300
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     Shigeru Yoshida <syoshida@...hat.com>
CC:     <ntfs3@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <syzbot+9d67170b20e8f94351c8@...kaller.appspotmail.com>
Subject: Re: [PATCH] fs/ntfs3: Fix memory leak on ntfs_fill_super() error path



On 8/23/22 13:32, 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;
>   

Thanks for patch, applied!