From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Sun, 2 Oct 2022 14:54:11 +0000 (+0900)
Subject: fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_fill_super()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=59bfd7a483da36bd202532a3d9ea1f14f3bf3aaf;p=linux.git

fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_fill_super()

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 <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>
---

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 1e2c04e48f98f..2fd1367a59820 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -1167,7 +1167,7 @@ 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;