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 9AF513093B5 for ; Wed, 5 Nov 2025 11:14:54 +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=1762341294; cv=none; b=iwCvNKKvMHU+cq6OWlXt2scuo7YlLveQSPYl1vhvUdh5JRkRhwvnoIPEFmT1ZciqFz7BZtNkpBePlq3K+7zi6BmBEKLjhiYg+s7jKrUdKxYiaZvCNNSntjFw7Z3mO6WWjlJEB1kTP3FZ99U7RXkWFVYw2YfUqUua4FHCfdNmf8w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762341294; c=relaxed/simple; bh=Hr1qTb8xrcj/E/cr8cExwDIT7AhrOUIw7GHOKQAcWp0=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=UGPphehTkebQPmQgY7xWpZ5yrSEBWssRMaY8K1ZR4lDzx738/DEKY8Sw87JeWlDzh/GGR4SsihlfDytaFpgYqPocDF0yYydEzVbbeFaBuSZZdgED/KLzWWSOrB0ZV+7vlqbNGPTjFGPFCRKDG9hPIDnzcAAvdmeGsjd4XK3pL64= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=p29hFktc; 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="p29hFktc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B78DC4CEF8; Wed, 5 Nov 2025 11:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762341294; bh=Hr1qTb8xrcj/E/cr8cExwDIT7AhrOUIw7GHOKQAcWp0=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=p29hFktc6Y/DOjgHQGqLmyPglzmOJ5TqpoSQR3mwqzS0cbSSFfYb+xVRfubj1TTjP 641tsmlYpm5Mp9BRgHHse9AOewUIIRBRRE+7tYAllNbUEND2ebt9ZTIHf0ToUoO4bv H/q3wc9seDlDK/bBB99enkqYv7kk3PU8tYHXHLKZYuz0z8WYPNBJNdw6eGFqhI72Hk IGHPU+ITHU+GVJm+IxKeH/iiGI3tCEYH2JrXDUrU3USk0tkLF1rPDcXRE+FX1q7eXY 25f9EvEhyFfRu49GKOvtzH4fMVcg9uUF1oezsHldg+TEO35VwmedO3rxT2kQ8IGc0S TqDWlDQhwskKw== Message-ID: <96a9d740-5a96-4795-b69e-0cd0e165ad4a@kernel.org> Date: Wed, 5 Nov 2025 19:14:48 +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@kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, linux-kernel-mentees@lists.linuxfoundation.org, khalid@kernel.org, stable@kernel.org, syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com Subject: Re: [PATCH v4 2/2] f2fs: Add sanity checks before unlinking and loading inodes To: "Nikola Z. Ivanov" , jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net References: Content-Language: en-US From: Chao Yu In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/5/25 19:09, Nikola Z. Ivanov wrote: > Add check for inode->i_nlink == 1 for directories during unlink, > as their value is decremented twice, which can trigger a warning in > drop_nlink. In such case mark the filesystem as corrupted and return > from the function call with the relevant failure return value. > > Additionally add the check for i_nlink == 1 in > sanity_check_inode in order to detect on-disk corruption early. > > Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083 > Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com > Signed-off-by: Nikola Z. Ivanov Reviewed-by: Chao Yu Thanks,