[PATCH AUTOSEL 6.0 16/27] fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_fill_super()

From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	syzot <syzbot+33f3faaa0c08744f7d40@syzkaller.appspotmail.com>,
	Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
	Sasha Levin <sashal@kernel.org>,
	ntfs3@lists.linux.dev
Subject: [PATCH AUTOSEL 6.0 16/27] fs/ntfs3: Use __GFP_NOWARN allocation at ntfs_fill_super()
Date: Tue, 27 Dec 2022 15:33:31 -0500	[thread overview]
Message-ID: <20221227203342.1213918-16-sashal@kernel.org> (raw)
In-Reply-To: <20221227203342.1213918-1-sashal@kernel.org>

From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

[ 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 [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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ntfs3/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 0c8dd4ff5d7a..bc6a41d254ba 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -1141,7 +1141,7 @@ 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;
-- 
2.35.1

