Re: [PATCH] f2fs: fix convert inline inode on readonly mode

[Chao Yu <chao@kernel.org>]

On 2024/6/12 10:20, Daejun Park wrote:
> syzbot reported a bug in f2fs_vm_page_mkwrite() which checks for
> f2fs_has_inline_data(inode).
> The bug was caused by f2fs_convert_inline_inode() not returning an
> error when called on a read-only filesystem, but returning with the
> inline attribute as set.
> This patch fixes the problem by ensuring that f2fs_convert_inline_inode()
> returns -EROFS on readonly.
> 
> Fixes: ec2ddf499402 ("f2fs: don't allow any writes on readonly mount")
> Reported-by: syzbot+f195123a45ad487ca66c@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=f195123a45ad487ca66c
> Signed-off-by: Daejun Park <daejun7.park@samsung.com>

Hi Daejun,

I guess below patch has fixed this issue, so we need to tag the report
as duplicated?

https://lore.kernel.org/linux-f2fs-devel/20240603010745.2246488-1-chao@kernel.org/T/#u

Thanks,

> ---
>   fs/f2fs/inline.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
> index 7638d0d7b7ee..ae1d8f2d82c9 100644
> --- a/fs/f2fs/inline.c
> +++ b/fs/f2fs/inline.c
> @@ -203,10 +203,12 @@ int f2fs_convert_inline_inode(struct inode *inode)
>          struct page *ipage, *page;
>          int err = 0;
> 
> -       if (!f2fs_has_inline_data(inode) ||
> -                       f2fs_hw_is_readonly(sbi) || f2fs_readonly(sbi->sb))
> +       if (!f2fs_has_inline_data(inode))
>                  return 0;
> 
> +       if (unlikely(f2fs_hw_is_readonly(sbi) || f2fs_readonly(sbi->sb)))
> +               return -EROFS;
> +
>          err = f2fs_dquot_initialize(inode);
>          if (err)
>                  return err;
> --
> 2.25.1
>