From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 259733CCFB8 for ; Fri, 3 Jul 2026 12:33:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783082024; cv=none; b=Qdi4vtqdh0kog+/VUU7KiWqX5q5dYqxHd2scRB08oOgM9KtcoD095vXV7Rl0qIbNTd6GL84eu6MrZAH+r2rEbtz/D2+tP//aKBsRV9rwUNYGI0mBTQUoSYfOU3ImLZjmOcyTYdoUri45k19JfE/TUwPDNC7aaWmwj60CtxVXzaA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783082024; c=relaxed/simple; bh=Iwx8oZ7/7Jr4sTS3vwCIMK2rRu3GdndaIh9ngB4ncgY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eqbMJ68hosYsMU3YVRxonKFtMNW8hSI5raNAYA+ktPa+WFqS6mx8dP1/Dd2FWNszKVAcWTkWmkVmls/QT6fZdxyWZYn/hRcpoa3ES1+utCMLjxPzwvk4ohLS7whugjyqmZHNTKXRzt2psbzoUQJ/63Mf2U/naYjj6g1T2jTulnM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GcV2Ko/T; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GcV2Ko/T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8FE0F1F000E9; Fri, 3 Jul 2026 12:33:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783082019; bh=IzTtUWvcvKwy5/CaSNmD9QE0NUxcM1je/AKQaH18lH8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GcV2Ko/TStpr5aVfO7MqhWtbfXpGuoLWol5CjTq1AfCqcbrtdG25RKszBkXSvfRP0 NEl3dCyfhRxNwzXrM92U8LkkjGAjwIEkDOVKx3MK6cDcELOK4r/Wtu1d0v3L0SpU8s QHvIQrZCCxCPo0TfuWWhK0rAkN1F/l9j+PT5A3UZdEDqiWkaJaBWri2PdA+0eFkEpj RMRxcMs2zOokI+4FEDHCOkoeNOx0K4eE1LHYYBf6q1SDDtx20JML9YJyb03P1Qs8j/ liTO+XVnBqWSLenIsG7Ng8rfSp82MY4Gvq87s1hPNDMY9aVA1kGuuLVymmSocF7/t8 Vx4IB8B29HhdQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Chao Yu , Jaegeuk Kim , Sasha Levin Subject: [PATCH 5.15.y 1/2] f2fs: fix to detect corrupted meta ino Date: Fri, 3 Jul 2026 08:33:35 -0400 Message-ID: <20260703123336.3945189-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026070218-taekwondo-skeletal-13d5@gregkh> References: <2026070218-taekwondo-skeletal-13d5@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chao Yu [ Upstream commit fcc2d8cc96b2f6141bbbe5b1e8953db990794b44 ] It is possible that ino of dirent or orphan inode is corrupted in a fuzzed image, occasionally, if corrupted ino is equal to meta ino: meta_ino, node_ino or compress_ino, caller of f2fs_iget() from below call paths will get meta inode directly, it's not allowed, let's add sanity check to detect such cases. case #1 - recover_dentry - __f2fs_find_entry - f2fs_iget_retry case #2 - recover_orphan_inode - f2fs_iget_retry Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Stable-dep-of: 5073c66a96a9 ("f2fs: validate compress cache inode only when enabled") Signed-off-by: Sasha Levin --- fs/f2fs/inode.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 7494a68a53196f..4a99a9eab8291d 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -496,6 +496,12 @@ static int do_read_inode(struct inode *inode) return 0; } +static bool is_meta_ino(struct f2fs_sb_info *sbi, unsigned int ino) +{ + return ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi) || + ino == F2FS_COMPRESS_INO(sbi); +} + struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) { struct f2fs_sb_info *sbi = F2FS_SB(sb); @@ -507,16 +513,21 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) { + if (is_meta_ino(sbi, ino)) { + f2fs_err(sbi, "inaccessible inode: %lu, run fsck to repair", ino); + set_sbi_flag(sbi, SBI_NEED_FSCK); + ret = -EFSCORRUPTED; + trace_f2fs_iget_exit(inode, ret); + iput(inode); + return ERR_PTR(ret); + } + trace_f2fs_iget(inode); return inode; } - if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi)) - goto make_now; -#ifdef CONFIG_F2FS_FS_COMPRESSION - if (ino == F2FS_COMPRESS_INO(sbi)) + if (is_meta_ino(sbi, ino)) goto make_now; -#endif ret = do_read_inode(inode); if (ret) -- 2.53.0