From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:58542 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752095AbdHNAds (ORCPT ); Sun, 13 Aug 2017 20:33:48 -0400 Subject: Patch "fuse: initialize the flock flag in fuse_file on allocation" has been added to the 3.18-stable tree To: mjurczyk@google.com, gregkh@linuxfoundation.org, mszeredi@redhat.com Cc: , From: Date: Sun, 13 Aug 2017 15:18:39 -0700 Message-ID: <150266271988174@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled fuse: initialize the flock flag in fuse_file on allocation to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: fuse-initialize-the-flock-flag-in-fuse_file-on-allocation.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 68227c03cba84a24faf8a7277d2b1a03c8959c2c Mon Sep 17 00:00:00 2001 From: Mateusz Jurczyk Date: Wed, 7 Jun 2017 12:26:49 +0200 Subject: fuse: initialize the flock flag in fuse_file on allocation From: Mateusz Jurczyk commit 68227c03cba84a24faf8a7277d2b1a03c8959c2c upstream. Before the patch, the flock flag could remain uninitialized for the lifespan of the fuse_file allocation. Unless set to true in fuse_file_flock(), it would remain in an indeterminate state until read in an if statement in fuse_release_common(). This could consequently lead to taking an unexpected branch in the code. The bug was discovered by a runtime instrumentation designed to detect use of uninitialized memory in the kernel. Signed-off-by: Mateusz Jurczyk Fixes: 37fb3a30b462 ("fuse: fix flock") Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -54,7 +54,7 @@ struct fuse_file *fuse_file_alloc(struct { struct fuse_file *ff; - ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); + ff = kzalloc(sizeof(struct fuse_file), GFP_KERNEL); if (unlikely(!ff)) return NULL; Patches currently in stable-queue which might be from mjurczyk@google.com are queue-3.18/fuse-initialize-the-flock-flag-in-fuse_file-on-allocation.patch