Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:43796 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754080AbcFEWDL (ORCPT ); Sun, 5 Jun 2016 18:03:11 -0400 Subject: Patch "Btrfs: fix divide error upon chunk's stripe_len" has been added to the 4.5-stable tree To: bo.li.liu@oracle.com, dsterba@suse.com, gregkh@linuxfoundation.org, quentin.casasnovas@oracle.com, vegard.nossum@oracle.com Cc: , From: Date: Sun, 05 Jun 2016 14:48:09 -0700 Message-ID: <146516328920522@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 Btrfs: fix divide error upon chunk's stripe_len to the 4.5-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: btrfs-fix-divide-error-upon-chunk-s-stripe_len.patch and it can be found in the queue-4.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From 3d8da67817606380fdadfa483d4dba5c3a5446c6 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Tue, 26 Apr 2016 17:53:31 -0700 Subject: Btrfs: fix divide error upon chunk's stripe_len From: Liu Bo commit 3d8da67817606380fdadfa483d4dba5c3a5446c6 upstream. The struct 'map_lookup' uses type int for @stripe_len, while btrfs_chunk_stripe_len() can return a u64 value, and it may end up with @stripe_len being undefined value and it can lead to 'divide error' in __btrfs_map_block(). This changes 'map_lookup' to use type u64 for stripe_len, also right now we only use BTRFS_STRIPE_LEN for stripe_len, so this adds a valid checker for BTRFS_STRIPE_LEN. Reported-by: Vegard Nossum Reported-by: Quentin Casasnovas Signed-off-by: Liu Bo Reviewed-by: David Sterba [ folded division fix to scrub_raid56_parity ] Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/scrub.c | 2 +- fs/btrfs/volumes.c | 2 +- fs/btrfs/volumes.h | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -2858,7 +2858,7 @@ static noinline_for_stack int scrub_raid int extent_mirror_num; int stop_loop = 0; - nsectors = map->stripe_len / root->sectorsize; + nsectors = div_u64(map->stripe_len, root->sectorsize); bitmap_len = scrub_calc_parity_bitmap_len(nsectors); sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len, GFP_NOFS); --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -6249,7 +6249,7 @@ static int read_one_chunk(struct btrfs_r "invalid chunk length %llu", length); return -EIO; } - if (!is_power_of_2(stripe_len)) { + if (!is_power_of_2(stripe_len) || stripe_len != BTRFS_STRIPE_LEN) { btrfs_err(root->fs_info, "invalid chunk stripe length: %llu", stripe_len); return -EIO; --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -347,7 +347,7 @@ struct map_lookup { u64 type; int io_align; int io_width; - int stripe_len; + u64 stripe_len; int sector_size; int num_stripes; int sub_stripes; Patches currently in stable-queue which might be from bo.li.liu@oracle.com are queue-4.5/btrfs-fix-unexpected-return-value-of-fiemap.patch queue-4.5/btrfs-do-not-create-empty-block-group-if-we-have-allocated-data.patch queue-4.5/btrfs-fix-divide-error-upon-chunk-s-stripe_len.patch