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 9BC7B332638; Thu, 20 Aug 2026 17:51:26 +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=1787248287; cv=none; b=muVZdT6TiWHvOorddWy/oOkOhNM2jwHznnuGdcNb3as50/JsYAryJ87THzQcOI2USgS2s3+BHwtYqq4+4Pe5bTMINdVdmL+BECb+vDIYcZTlReNdiQDB9ILrZxRpKIXkDMC6ResYgQpdMp7NDoaWFHeUZ1yPGTIfxAiR/d81DvA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787248287; c=relaxed/simple; bh=P3jR/hTn9vnvAPuPpaeQFRqoOSTtJpJkNzvwRaXfEfQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VjOcKfqutO3/TWuefe83UviRy5B3KE8agTLMligm+LOdhGUtDWDibZAC0yLnYI8bwt2DHORhynQ1N0hCbGtsDwC7DEvdlNfgREuqLos/2T3lk5SfnW9MyUhG6MLDdN8qK2JPhw+DCdyQomwM0KlBx/WjpAvaB2SzxG9EJR5yk20= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=B3n/dGfl; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="B3n/dGfl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03DC41F000E9; Thu, 20 Aug 2026 17:51:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787248286; bh=GkyN98EWx+FllFn4spmbN3o5qS5rR2lVByGcBHzpHvI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=B3n/dGflbUoyXSq/y1nIWnBPnIAjH37yuC3BrPZpKjG+cc99Lh3F7e9AzJ1XAc7fP IgFNdltZw1+ca2Xr6xV/TE5JLxtOmNGJ5DY1xMRJfmv/QPmKgVUtzZdQOXChA1fu0b GaIaS0PKZhdWAPUYlsAnHxLFyDBFNNRyQIdHWl0s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Reinette Chatre , "Borislav Petkov (AMD)" , stable@kernel.org, Sasha Levin Subject: [PATCH 6.1 174/303] fs/resctrl: Fix double-add of pseudo-locked regions RMID to free list Date: Thu, 20 Aug 2026 16:55:10 +0200 Message-ID: <20260820145258.535942668@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145253.200766705@linuxfoundation.org> References: <20260820145253.200766705@linuxfoundation.org> User-Agent: quilt/0.69 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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Reinette Chatre [ Upstream commit b9f089723aee892efc77c349ae47a6b452b293c4 ] A pseudo-locked group's RMID is freed when it is created. On unmount rmdir_all_sub() unconditionally frees all RMID of all groups, resulting in a double-free of the pseudo-locked group's RMID. The consequence of this is that the original free results in the pseudo-locked group's RMID being added to the rmid_free_lru linked list and the second free then attempts to add the same RMID entry to the rmid_free_lru again. Do not double-free a pseudo-locked group's RMID. Fixes: e0bdfe8e36f3 ("x86/intel_rdt: Support creation/removal of pseudo-locked region") Signed-off-by: Reinette Chatre Signed-off-by: Borislav Petkov (AMD) Cc: Link: https://patch.msgid.link/551432dd7e624a862b8e58314c38aaba0afff3e9.1783377598.git.reinette.chatre@intel.com Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -2477,10 +2477,6 @@ static void rmdir_all_sub(void) if (rdtgrp == &rdtgroup_default) continue; - if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || - rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) - rdtgroup_pseudo_lock_remove(rdtgrp); - /* * Give any CPUs back to the default group. We cannot copy * cpu_online_mask because a CPU might have executed the @@ -2489,7 +2485,13 @@ static void rmdir_all_sub(void) cpumask_or(&rdtgroup_default.cpu_mask, &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); - free_rmid(rdtgrp->mon.rmid); + if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || + rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { + rdtgroup_pseudo_lock_remove(rdtgrp); + } else { + /* Pseudo-locked group's RMID is freed during setup. */ + free_rmid(rdtgrp->mon.rmid); + } kernfs_remove(rdtgrp->kn); list_del(&rdtgrp->rdtgroup_list);