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 CB3D23A7D63 for ; Tue, 12 May 2026 14:02:14 +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=1778594534; cv=none; b=LkdUN6VPwM79iaea8T8FOXEt/yrSNAbPQV1IBmxVCgR2pftDhFz5EG5GoBOEsq4F9MccAELtphW9Tfsno5bnmPubmnZ1HV55jyp8c5mcV3DH5taAxFT3Zmk29rLS8v/Tk4uic7W7JJ8/OTlhI3SoOFgsBSeEis4mhHoPtSAdG+g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778594534; c=relaxed/simple; bh=XVVrrNFNl+l27pbBRsVyDmaKGaUVlQXEWLWjUly/rLw=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=XFHmA69vCR/IPiaUjMt+rnXisLac3+AcIyHKRw/zBqb6qxeePHoj9wQfgWGXpEEVyepJYy2L6ulk1hJRxDP+TYmH0wx1RNrv+uoTsfqnUMM7SvQIztII3eg7vko519N9g3G9CHGIux0+hO6Kst5wpdHelxJTYnBmC8LsXdWDBoA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kHOiGhqX; 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="kHOiGhqX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6037DC2BCF6; Tue, 12 May 2026 14:02:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778594534; bh=XVVrrNFNl+l27pbBRsVyDmaKGaUVlQXEWLWjUly/rLw=; h=Subject:To:Cc:From:Date:From; b=kHOiGhqX06Y+knP7sSDlNtaNFp1aNCWkNwOAq+dnyfRCmHQR1rl2iA5D3vmoPbOwU CtOJGbPdUma0ZU9zuDeUfgzOvjgjaAkDsCWNTxrKzNp7kP/xm+xD3cUxAIf+oMh3Vx u/F4WOx25lxnl7q4dyphMkU1+h+VtxK1XCH+7IJw= Subject: FAILED: patch "[PATCH] btrfs: fix double free in create_space_info_sub_group() error" failed to apply to 6.12-stable tree To: lgs201920130244@gmail.com,dsterba@suse.com,wqu@suse.com Cc: From: Date: Tue, 12 May 2026 15:58:35 +0200 Message-ID: <2026051235-rockband-barrel-a707@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x a7449edf96143f192606ec8647e3167e1ecbd728 # git commit -s git send-email --to '' --in-reply-to '2026051235-rockband-barrel-a707@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From a7449edf96143f192606ec8647e3167e1ecbd728 Mon Sep 17 00:00:00 2001 From: Guangshuo Li Date: Wed, 1 Apr 2026 19:02:19 +0800 Subject: [PATCH] btrfs: fix double free in create_space_info_sub_group() error path When kobject_init_and_add() fails, the call chain is: create_space_info_sub_group() -> btrfs_sysfs_add_space_info_type() -> kobject_init_and_add() -> failure -> kobject_put(&sub_group->kobj) -> space_info_release() -> kfree(sub_group) Then control returns to create_space_info_sub_group(), where: btrfs_sysfs_add_space_info_type() returns error -> kfree(sub_group) Thus, sub_group is freed twice. Keep parent->sub_group[index] = NULL for the failure path, but after btrfs_sysfs_add_space_info_type() has called kobject_put(), let the kobject release callback handle the cleanup. Fixes: f92ee31e031c ("btrfs: introduce btrfs_space_info sub-group") CC: stable@vger.kernel.org # 6.18+ Reviewed-by: Qu Wenruo Signed-off-by: Guangshuo Li Signed-off-by: David Sterba diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index e017bb182c8c..8278e7998bc9 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -287,10 +287,8 @@ static int create_space_info_sub_group(struct btrfs_space_info *parent, u64 flag sub_group->subgroup_id = id; ret = btrfs_sysfs_add_space_info_type(sub_group); - if (ret) { - kfree(sub_group); + if (ret) parent->sub_group[index] = NULL; - } return ret; }