From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82B62C433E5 for ; Tue, 14 Jul 2020 18:47:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5311F22B2A for ; Tue, 14 Jul 2020 18:47:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752478; bh=fqGRKodDfAmRZ3jBF24oNzEycjzTMB88crVtKJQoM9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JQSfqezfh2MK1n/z6bDhRyfiI9WrfUBZVuUscdEt2AHbG3GGFn0AIOipy0eFO/Khz X68zsHr5PxQADlsidfZsNv23mPB3adUm91KTelseDAnFJXYOzh0rs2CEg0nNHenG1y Oo/ZDPElari+ovyBhGovw05NRA9bVAkU7Fr8On3o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729856AbgGNSr5 (ORCPT ); Tue, 14 Jul 2020 14:47:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:43180 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729841AbgGNSry (ORCPT ); Tue, 14 Jul 2020 14:47:54 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4A65D22B2E; Tue, 14 Jul 2020 18:47:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752473; bh=fqGRKodDfAmRZ3jBF24oNzEycjzTMB88crVtKJQoM9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZvO/8bpMvpc0JZzUOMSYU2JWpbzP37aF6yl9Jh2ul1uW+s7VvhS796q9cPE7o3HJ7 A5mUreo/B+PDs6VKUsj0d3OEHXRBHgeyZKEc+c07uQGCwfBq2CLVCBviSHst8ZiM97 6Q8xdzIU2giiL69mV95E/i4uTZzhf2LsRJi/Ycj8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tom Rix , Alex Deucher Subject: [PATCH 4.19 54/58] drm/radeon: fix double free Date: Tue, 14 Jul 2020 20:44:27 +0200 Message-Id: <20200714184058.858942716@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200714184056.149119318@linuxfoundation.org> References: <20200714184056.149119318@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Rix commit 41855a898650803e24b284173354cc3e44d07725 upstream. clang static analysis flags this error drivers/gpu/drm/radeon/ci_dpm.c:5652:9: warning: Use of memory after it is freed [unix.Malloc] kfree(rdev->pm.dpm.ps[i].ps_priv); ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/ci_dpm.c:5654:2: warning: Attempt to free released memory [unix.Malloc] kfree(rdev->pm.dpm.ps); ^~~~~~~~~~~~~~~~~~~~~~ problem is reported in ci_dpm_fini, with these code blocks. for (i = 0; i < rdev->pm.dpm.num_ps; i++) { kfree(rdev->pm.dpm.ps[i].ps_priv); } kfree(rdev->pm.dpm.ps); The first free happens in ci_parse_power_table where it cleans up locally on a failure. ci_dpm_fini also does a cleanup. ret = ci_parse_power_table(rdev); if (ret) { ci_dpm_fini(rdev); return ret; } So remove the cleanup in ci_parse_power_table and move the num_ps calculation to inside the loop so ci_dpm_fini will know how many array elements to free. Fixes: cc8dbbb4f62a ("drm/radeon: add dpm support for CI dGPUs (v2)") Signed-off-by: Tom Rix Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/ci_dpm.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/drivers/gpu/drm/radeon/ci_dpm.c +++ b/drivers/gpu/drm/radeon/ci_dpm.c @@ -5574,6 +5574,7 @@ static int ci_parse_power_table(struct r if (!rdev->pm.dpm.ps) return -ENOMEM; power_state_offset = (u8 *)state_array->states; + rdev->pm.dpm.num_ps = 0; for (i = 0; i < state_array->ucNumEntries; i++) { u8 *idx; power_state = (union pplib_power_state *)power_state_offset; @@ -5583,10 +5584,8 @@ static int ci_parse_power_table(struct r if (!rdev->pm.power_state[i].clock_info) return -EINVAL; ps = kzalloc(sizeof(struct ci_ps), GFP_KERNEL); - if (ps == NULL) { - kfree(rdev->pm.dpm.ps); + if (ps == NULL) return -ENOMEM; - } rdev->pm.dpm.ps[i].ps_priv = ps; ci_parse_pplib_non_clock_info(rdev, &rdev->pm.dpm.ps[i], non_clock_info, @@ -5608,8 +5607,8 @@ static int ci_parse_power_table(struct r k++; } power_state_offset += 2 + power_state->v2.ucNumDPMLevels; + rdev->pm.dpm.num_ps = i + 1; } - rdev->pm.dpm.num_ps = state_array->ucNumEntries; /* fill in the vce power states */ for (i = 0; i < RADEON_MAX_VCE_LEVELS; i++) {