From patchwork Mon May 20 10:50:35 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Henriques X-Patchwork-Id: 244913 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id A498E2C00A7 for ; Mon, 20 May 2013 20:54:01 +1000 (EST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1UeNj0-0006O7-Ek; Mon, 20 May 2013 10:53:54 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1UeNht-0005nB-BU for kernel-team@lists.ubuntu.com; Mon, 20 May 2013 10:52:45 +0000 Received: from bl20-156-11.dsl.telepac.pt ([2.81.156.11] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1UeNht-00089G-49; Mon, 20 May 2013 10:52:45 +0000 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Subject: [PATCH 035/115] drm/radeon: fix possible segfault when parsing pm tables Date: Mon, 20 May 2013 11:50:35 +0100 Message-Id: <1369047116-9378-36-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1369047116-9378-1-git-send-email-luis.henriques@canonical.com> References: <1369047116-9378-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.5 Cc: Alex Deucher X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com 3.5.7.13 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher commit f8e6bfc2ce162855fa4f9822a45659f4b542c960 upstream. If we have a empty power table, bail early and allocate the default power state. Should fix: https://bugs.freedesktop.org/show_bug.cgi?id=63865 Signed-off-by: Alex Deucher Signed-off-by: Luis Henriques --- drivers/gpu/drm/radeon/radeon_atombios.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c index 5e30e12..78d584e 100644 --- a/drivers/gpu/drm/radeon/radeon_atombios.c +++ b/drivers/gpu/drm/radeon/radeon_atombios.c @@ -1998,6 +1998,8 @@ static int radeon_atombios_parse_power_table_1_3(struct radeon_device *rdev) num_modes = power_info->info.ucNumOfPowerModeEntries; if (num_modes > ATOM_MAX_NUMBEROF_POWER_BLOCK) num_modes = ATOM_MAX_NUMBEROF_POWER_BLOCK; + if (num_modes == 0) + return state_index; rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state) * num_modes, GFP_KERNEL); if (!rdev->pm.power_state) return state_index; @@ -2396,6 +2398,8 @@ static int radeon_atombios_parse_power_table_4_5(struct radeon_device *rdev) power_info = (union power_info *)(mode_info->atom_context->bios + data_offset); radeon_atombios_add_pplib_thermal_controller(rdev, &power_info->pplib.sThermalController); + if (power_info->pplib.ucNumStates == 0) + return state_index; rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state) * power_info->pplib.ucNumStates, GFP_KERNEL); if (!rdev->pm.power_state) @@ -2494,6 +2498,8 @@ static int radeon_atombios_parse_power_table_6(struct radeon_device *rdev) non_clock_info_array = (struct _NonClockInfoArray *) (mode_info->atom_context->bios + data_offset + le16_to_cpu(power_info->pplib.usNonClockInfoArrayOffset)); + if (state_array->ucNumEntries == 0) + return state_index; rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state) * state_array->ucNumEntries, GFP_KERNEL); if (!rdev->pm.power_state) @@ -2584,7 +2590,9 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev) default: break; } - } else { + } + + if (state_index == 0) { rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state), GFP_KERNEL); if (rdev->pm.power_state) { rdev->pm.power_state[0].clock_info =