From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF4A46AAD for ; Mon, 2 Dec 2024 13:18:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733145533; cv=none; b=MMmNoT5TRFWMQ5iZx27OBYbtHB3JDLIQnjq17qKHU2eRFa5CdRqIsONVs0n/zKhUbH8qA1hYtMGfP0o9AG8abkV4GzobvNCfSf23PHsAKNZoQA5rOw3L0IIyc4Zgr4cN0hxqsKxU/wJimgTjoG8OZFNXjzLqWeY7CrKqC+GBwnI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733145533; c=relaxed/simple; bh=6yQGHkRsvK/WA7VpGDijIwaS68k78J3KEAp0crQkHdc=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=LxKnB6txLid7zMlDVTf9mJoRubSH0KJO0z51sf0KInN0ZqDvIMUJxgNZIvug57M1gCis4CvNrmia1V4fRXoszAwM0CvzkDQIeb5hEc1vOGjigmzaz3nkAGjh97uIJkcv5es3d6bdEIhE7XsvGnhjn3NyinemycP+aF/gKh/fjBo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lMN3JGJR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lMN3JGJR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1566FC4CED1; Mon, 2 Dec 2024 13:18:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733145533; bh=6yQGHkRsvK/WA7VpGDijIwaS68k78J3KEAp0crQkHdc=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=lMN3JGJRpKylMai6p8/Bhe1tZQ5DP/oyQNcp8wmW7pE5gkcpNKIpaaSsmeu4ExTd/ xEf1USm5bF48YEjQR1/Bt7X/weXNbpiiUOBZagbosakpNY9sLZAguR9lcqtgXOoD/E VFXi+Fi5n5YlFu6MuCrZWVVXvTYCfmC0B7NuwIFQR+UuELs4nvADYZ+s5Zb1SquByb NmfXyp8k2K8NQbtvD4mq/SwLfvx2Ey6vu4FOUPG2WXw2/tXPjlFqedCad455A6w0HZ ODzJk/Ko9j52yJ8nhxN8ExFNjb+YFGNVu1F0GWGrIDvMZczpEYWCP25LAKPR4nFR95 q6cGumGmjINnw== Message-ID: Date: Mon, 2 Dec 2024 21:18:44 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: Chao Yu , linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, shuah@kernel.org, anupnewsmail@gmail.com, linux-kernel-mentees@lists.linuxfoundation.org, syzbot+b01a36acd7007e273a83@syzkaller.appspotmail.com Subject: Re: [PATCH v2] f2fs: Add check for deleted inode To: Leo Stone , jaegeuk@kernel.org References: <20241129185642.6483-1-leocstone@gmail.com> Content-Language: en-US From: Chao Yu Autocrypt: addr=chao@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2024/11/30 2:56, Leo Stone wrote: > The syzbot reproducer mounts a f2fs image, then tries to unlink an > existing file. However, the unlinked file already has a link count of 0 > when it is read for the first time in do_read_inode(). > > Add a check to sanity_check_inode() for i_nlink == 0. > > Reported-by: syzbot+b01a36acd7007e273a83@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=b01a36acd7007e273a83 > Fixes: 5d64600d4f33 ("f2fs: avoid bug_on on corrupted inode") 39a53e0ce0df ("f2fs: add superblock and major in-memory structure")? Due to it missed to do sanity check on i_nlink in initialization version of f2fs. Thanks, Thanks, > Signed-off-by: Leo Stone > --- > v2: Correct "Fixes" line > v1: https://lore.kernel.org/all/20241124010459.23283-1-leocstone@gmail.com/T/ > --- > fs/f2fs/inode.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > index 1ed86df343a5..65f1dc32f173 100644 > --- a/fs/f2fs/inode.c > +++ b/fs/f2fs/inode.c > @@ -372,6 +372,12 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page) > return false; > } > > + if (inode->i_nlink == 0) { > + f2fs_warn(sbi, "%s: inode (ino=%lx) has a link count of 0", > + __func__, inode->i_ino); > + return false; > + } > + > return true; > } >