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 75B057E110; Wed, 21 Feb 2024 14:17:33 +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=1708525053; cv=none; b=mxTrKkI1gGDIEZHZXVqoTK2FoS46OhtB+l46tB2hxmZm8oyk2SpFDM+Nyjx5sPKNGy8YcFpX6XTnBiYT80CyFQRU3b0DW++IAJyaz28e6oktEXKdfwwEo5OymLfpFx/QT0Ci1BkwZEpURCFrD+1gWoJpfB9Ca5+eBwZyHgS12Gc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708525053; c=relaxed/simple; bh=R57DPq9Sm+ctCaYKTcdYCG5gKODlcZwyX1x7cqtov8I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qzyyN/unhtko21+50TV8+sf6y9CDOO1Ip5U/xhnA7KqV2k4BUfha3FbewCOMO/0FVg9ndeegv7Lfg6mHif+5aUI+yScGa+Dctnl7n2ehM4UPrxNjI1YcHHJRMWyXyd5QKbgr49Dao8w5OPiBXK7EjLeIYJiW0rIW5nr/7Bf/OP4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=u5wa1q4M; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="u5wa1q4M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7566C433F1; Wed, 21 Feb 2024 14:17:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708525053; bh=R57DPq9Sm+ctCaYKTcdYCG5gKODlcZwyX1x7cqtov8I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u5wa1q4MsKXJkzdnUgajg02AC2VauTSd7TzRVLe/F5stEzmMeRmwV0aL+197K9BHq f4Ncg+2zXzAlNfSzjvPWl4vgy6UDoVGhXPlN8uRwNiNYzjiom4+uvtpa5u3KI2t0op uzbKCD+Ma3Chwn9njHtx6or4u3ae3858hS4MbjRs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhihao Cheng , Eric Biggers , Eric Biggers , Richard Weinberger Subject: [PATCH 5.4 018/267] ubifs: ubifs_symlink: Fix memleak of inode->i_link in error path Date: Wed, 21 Feb 2024 14:05:59 +0100 Message-ID: <20240221125940.624029313@linuxfoundation.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240221125940.058369148@linuxfoundation.org> References: <20240221125940.058369148@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhihao Cheng commit 1e022216dcd248326a5bb95609d12a6815bca4e2 upstream. For error handling path in ubifs_symlink(), inode will be marked as bad first, then iput() is invoked. If inode->i_link is initialized by fscrypt_encrypt_symlink() in encryption scenario, inode->i_link won't be freed by callchain ubifs_free_inode -> fscrypt_free_inode in error handling path, because make_bad_inode() has changed 'inode->i_mode' as 'S_IFREG'. Following kmemleak is easy to be reproduced by injecting error in ubifs_jnl_update() when doing symlink in encryption scenario: unreferenced object 0xffff888103da3d98 (size 8): comm "ln", pid 1692, jiffies 4294914701 (age 12.045s) backtrace: kmemdup+0x32/0x70 __fscrypt_encrypt_symlink+0xed/0x1c0 ubifs_symlink+0x210/0x300 [ubifs] vfs_symlink+0x216/0x360 do_symlinkat+0x11a/0x190 do_syscall_64+0x3b/0xe0 There are two ways fixing it: 1. Remove make_bad_inode() in error handling path. We can do that because ubifs_evict_inode() will do same processes for good symlink inode and bad symlink inode, for inode->i_nlink checking is before is_bad_inode(). 2. Free inode->i_link before marking inode bad. Method 2 is picked, it has less influence, personally, I think. Cc: stable@vger.kernel.org Fixes: 2c58d548f570 ("fscrypt: cache decrypted symlink target in ->i_link") Signed-off-by: Zhihao Cheng Suggested-by: Eric Biggers Reviewed-by: Eric Biggers Signed-off-by: Richard Weinberger Signed-off-by: Greg Kroah-Hartman --- fs/ubifs/dir.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -1206,6 +1206,8 @@ out_cancel: dir_ui->ui_size = dir->i_size; mutex_unlock(&dir_ui->ui_mutex); out_inode: + /* Free inode->i_link before inode is marked as bad. */ + fscrypt_free_inode(inode); make_bad_inode(inode); iput(inode); out_fname: