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 78B43495ADA; Thu, 17 Sep 2026 17:54:09 +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=1789667650; cv=none; b=j2k7n0Zr8f0WMDVC5FdogI1A/4Twl0y3XoWAlOmItE3oMMvXn95IGz1Fd0eb7uyNkydDq5y881Buyf4ZKNlhOLWovRsrIcvujqohaO0rvdMrRgyw+LIPk6unMcPbN7LhmzuIjBG7lEXGPd+pgLY4bUOqy1ipdWHAAIN8pXp3Lto= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789667650; c=relaxed/simple; bh=lOk+moB0VKqCD0GZG2LXxK1PBrC5I0x8FPSoQgd7VmI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Uf9wDK0ge3KQ+iEVsHIx4J9X7cVQVbRIRX4svMsShgmy5XaRTQw99rzzCHWuJRLnR7wdcVSizbArrVwy6eqHzYt9B99BmHp2wctrTFAn7/dLkNFvT21PnBB0XPu2OqP2Wv0cykhHIJ0ifDUtQOQ36c/hvxvuiRye8V2P+hmCucg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gF+z5ZR3; 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="gF+z5ZR3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 875071F000FF; Thu, 17 Sep 2026 17:54:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789667649; bh=c9ZiXF2O7lXHfPzS++c4xKHtyWKRgq/h/agGnDT8TeQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=gF+z5ZR3fEdP/8oXrw1stNeZlphoF905janCttSMejy28m+VKCIUvkeIOggFrP4JD YaoY464GRaPHuld7CiREHJ1vFDF62RgIG58NcMKuCYyfqVnpJc7X5nDbj1NC5GRSFH gfvNsVzdc5wXzWprsbRzKq+ve8x56IbNpW8uBtyk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, ikaros , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 6.12 0162/1102] ACPICA: Fix use-after-free in acpi_ds_terminate_control_method() Date: Thu, 17 Sep 2026 16:01:45 +0100 Message-ID: <20260917151543.604018347@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151539.408551884@linuxfoundation.org> References: <20260917151539.408551884@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: ikaros [ Upstream commit 945e87267cfd90937b3c637f87324cbb56998b72 ] Fix use-after-free issue in acpi_ds_terminate_control_method() by clearing references to method locals and arguments. Link: https://github.com/acpica/acpica/commit/36f22a94cb1b Signed-off-by: ikaros Signed-off-by: Rafael J. Wysocki Link: https://patch.msgid.link/8730924.NyiUUSuA9g@rafael.j.wysocki Signed-off-by: Sasha Levin --- drivers/acpi/acpica/dsmethod.c | 43 ++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c index 6168597a96e6f..d0096425468cb 100644 --- a/drivers/acpi/acpica/dsmethod.c +++ b/drivers/acpi/acpica/dsmethod.c @@ -698,6 +698,8 @@ void acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, struct acpi_walk_state *walk_state) { + u32 i; + struct acpi_namespace_node *ref_node; ACPI_FUNCTION_TRACE_PTR(ds_terminate_control_method, walk_state); @@ -708,6 +710,47 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc, } if (walk_state) { + /* + * Check if the return value is a ref_of reference to a method local + * or argument. If so, clear the reference to avoid use-after-free + * when the walk state is deleted. + */ + if (walk_state->return_desc && + (walk_state->return_desc->common.type == + ACPI_TYPE_LOCAL_REFERENCE) + && (walk_state->return_desc->reference.class == + ACPI_REFCLASS_REFOF)) { + ref_node = walk_state->return_desc->reference.object; + if (ref_node) { + + /* Check against method locals */ + for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) { + if (ref_node == + &walk_state->local_variables[i]) { + acpi_ut_remove_reference + (walk_state->return_desc); + walk_state->return_desc = NULL; + break; + } + } + + /* Check against method arguments if not already cleared */ + if (walk_state->return_desc) { + for (i = 0; i < ACPI_METHOD_NUM_ARGS; + i++) { + if (ref_node == + &walk_state->arguments[i]) { + acpi_ut_remove_reference + (walk_state-> + return_desc); + walk_state-> + return_desc = NULL; + break; + } + } + } + } + } /* Delete all arguments and locals */ -- 2.53.0