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 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BF79AC369D6 for ; Wed, 25 Sep 2024 12:15:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 59EA210E9ED; Wed, 25 Sep 2024 12:15:50 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="Buc81z9x"; dkim-atps=neutral Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C8E410E82A; Wed, 25 Sep 2024 12:15:49 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 7E937A44198; Wed, 25 Sep 2024 12:15:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98D34C4CECD; Wed, 25 Sep 2024 12:15:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727266548; bh=5bfg9Np6bY0Jpv5tAQ9Z9bpL4qFbDPQOKp0xgywQmGA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Buc81z9x9aKAC3hfA+FtsiCtWTYZsxGix5hG2KaOZbrIaeinpeiw8sdQl+ErqTar1 UYyggqmlHxq0T7OluxuVJlxoAnlYx22vgXfXCXIfs0cEe9S6nn04Pf2xIITwC3Fsg2 u8fkyvRd/IgMRWClY9MsAHZKiJ+BNLZAE0gTcEzWyXzwK8iIKMIQXrTxIwCeRU0Sh+ v57xYnBbC5DC7v4RUJ26cX3gpXhDDU1pDJ2j5wa9C3GZg/1VZhWrdFRHqcMmBQxftQ WDtg9fPXgUuT8fuyE4AR98uskzgOE1Ax2sLm1LXmj5jswij1HqfvSHj4Cotea/WXlC uaWRFJdKyjGTA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alex Hung , Rodrigo Siqueira , Tom Chung , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, alvin.lee2@amd.com, wayne.lin@amd.com, wenjing.liu@amd.com, sungjoon.kim@amd.com, aurabindo.pillai@amd.com, dillon.varone@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.6 092/139] drm/amd/display: Check null pointers before using dc->clk_mgr Date: Wed, 25 Sep 2024 08:08:32 -0400 Message-ID: <20240925121137.1307574-92-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240925121137.1307574-1-sashal@kernel.org> References: <20240925121137.1307574-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.52 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Alex Hung [ Upstream commit 95d9e0803e51d5a24276b7643b244c7477daf463 ] [WHY & HOW] dc->clk_mgr is null checked previously in the same function, indicating it might be null. Passing "dc" to "dc->hwss.apply_idle_power_optimizations", which dereferences null "dc->clk_mgr". (The function pointer resolves to "dcn35_apply_idle_power_optimizations".) This fixes 1 FORWARD_NULL issue reported by Coverity. Reviewed-by: Rodrigo Siqueira Signed-off-by: Alex Hung Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/core/dc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index 0b2eb2a6c8e14..a7a6f6c5c7655 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -4716,7 +4716,8 @@ void dc_allow_idle_optimizations(struct dc *dc, bool allow) if (allow == dc->idle_optimizations_allowed) return; - if (dc->hwss.apply_idle_power_optimizations && dc->hwss.apply_idle_power_optimizations(dc, allow)) + if (dc->hwss.apply_idle_power_optimizations && dc->clk_mgr != NULL && + dc->hwss.apply_idle_power_optimizations(dc, allow)) dc->idle_optimizations_allowed = allow; } -- 2.43.0