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 8AEA92BE7D3; Wed, 23 Apr 2025 15:34:01 +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=1745422441; cv=none; b=Z1R5sNaHvX/p4v++DwSHHH7W5tfWLE6c6uHso0gqlJa8xD2DY1eQyDy9gkGFF6Y10tiFib+bcJVrtXz4Lxox0dQKAnnpq40Rcep4eAEODeprCF08DnKPqp8Z2nXVBi3e73duXOvtlZHAPN7EjzL9WdRiZRrDAUbiE/BicXAGsFw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745422441; c=relaxed/simple; bh=po44SUmFkm/NmVTbandtsrLVLFdXot1O5+4STaVEAmo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Vxry118hBMLWJWnp7UULFDDJ6RB6GC19sB0obJzNMzNRxzHTSiK+P9c06aPrlX4n98SxJGKHu2XjskggxE6vb9d1n1F2CF/F9lui0FT+SL/SirFa2DQxY5oRVbcOxeQyChgSsb4Fsmsgxrk7AXN2oLxWuYfjlHymH526ofYXCRs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hHJdLu3k; 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="hHJdLu3k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5506C4CEE2; Wed, 23 Apr 2025 15:34:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745422441; bh=po44SUmFkm/NmVTbandtsrLVLFdXot1O5+4STaVEAmo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hHJdLu3kBMy3xQMhOhtavJNuMYqWpHGx9JMvvQQnU9r1MxZnYw7q7ZcJCDGEKBTVr SddemnxvAyqR4vJ8xr1cHG4xiMlii/9kRHBlRaxZzbzN9prDlWIoy902nSdDh89bcq xkh7LQfuTii2trNbJE2IdnbFCPHazLBU2h7huRCM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Denis Arefev , Alex Deucher Subject: [PATCH 6.6 350/393] drm/amd/pm/powerplay: Prevent division by zero Date: Wed, 23 Apr 2025 16:44:06 +0200 Message-ID: <20250423142657.795477687@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250423142643.246005366@linuxfoundation.org> References: <20250423142643.246005366@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Denis Arefev commit 4b8c3c0d17c07f301011e2908fecd2ebdcfe3d1c upstream. The user can set any speed value. If speed is greater than UINT_MAX/8, division by zero is possible. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: c52dcf49195d ("drm/amd/pp: Avoid divide-by-zero in fan_ctrl_set_fan_speed_rpm") Signed-off-by: Denis Arefev Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c @@ -307,10 +307,10 @@ int vega10_fan_ctrl_set_fan_speed_rpm(st int result = 0; if (hwmgr->thermal_controller.fanInfo.bNoFan || - speed == 0 || + (!speed || speed > UINT_MAX/8) || (speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) || (speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM)) - return -1; + return -EINVAL; if (PP_CAP(PHM_PlatformCaps_MicrocodeFanControl)) result = vega10_fan_ctrl_stop_smc_fan_control(hwmgr);