Re: [PATCH] fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_load_attr_list()

[Konstantin Komarov <almaz.alexandrovich@paragon-software.com>]

On 02.01.2023 18:53, Tetsuo Handa wrote:
> syzbot is reporting too large allocation at ntfs_load_attr_list() [1], for
> a crafted filesystem can have huge data_size.
>
> Link: https://syzkaller.appspot.com/bug?extid=89dbb3a789a5b9711793 [1]
> Reported-by: syzbot <syzbot+89dbb3a789a5b9711793@syzkaller.appspotmail.com>
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> ---
>   fs/ntfs3/attrlist.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ntfs3/attrlist.c b/fs/ntfs3/attrlist.c
> index c0c6bcbc8c05..81c22df27c72 100644
> --- a/fs/ntfs3/attrlist.c
> +++ b/fs/ntfs3/attrlist.c
> @@ -52,7 +52,7 @@ int ntfs_load_attr_list(struct ntfs_inode *ni, struct ATTRIB *attr)
>   
>   	if (!attr->non_res) {
>   		lsize = le32_to_cpu(attr->res.data_size);
> -		le = kmalloc(al_aligned(lsize), GFP_NOFS);
> +		le = kmalloc(al_aligned(lsize), GFP_NOFS | __GFP_NOWARN);
>   		if (!le) {
>   			err = -ENOMEM;
>   			goto out;
> @@ -80,7 +80,7 @@ int ntfs_load_attr_list(struct ntfs_inode *ni, struct ATTRIB *attr)
>   		if (err < 0)
>   			goto out;
>   
> -		le = kmalloc(al_aligned(lsize), GFP_NOFS);
> +		le = kmalloc(al_aligned(lsize), GFP_NOFS | __GFP_NOWARN);
>   		if (!le) {
>   			err = -ENOMEM;
>   			goto out;

I apologize for the delayed response.

Thanks, your patch has been applied.