fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_fill_super()

[ Upstream commit 59bfd7a ]

syzbot is reporting too large allocation at ntfs_fill_super() [1], for a
crafted filesystem can contain bogus inode->i_size. Add __GFP_NOWARN in
order to avoid too large allocation warning, than exhausting memory by
using kvmalloc().

Link: https://syzkaller.appspot.com/bug?extid=33f3faaa0c08744f7d40 [1]
Reported-by: syzot <[email protected]>
Signed-off-by: Tetsuo Handa <[email protected]>
Signed-off-by: Konstantin Komarov <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Tetsuo Handa

fs/ntfs3/super.c

@@ -1136,7 +1136,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
 		goto put_inode_out;
 	}
 	bytes = inode->i_size;
-	sbi->def_table = t = kmalloc(bytes, GFP_NOFS);
+	sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN);
 	if (!t) {
 		err = -ENOMEM;
 		goto put_inode_out;