fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_fill_super()

[ Upstream commit 59bfd7a483da36bd202532a3d9ea1f14f3bf3aaf ]

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
Reported-by: syzot <syzbot+33f3faaa0c08744f7d40@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index a18fb43..33b1833 100644 (file)
--- a/fs/ntfs3/super.c
+++ b/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;