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 20CBC22315C; Wed, 25 Sep 2024 12:15:33 +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=1727266533; cv=none; b=GQOAze+7lCguaDpzoB9ISniR8dtcxpZW3NKUM0gLR1JNCW8b3sqgVK7QOsmFqEl/VNgvCcslQVbU58R9CAx1Wb9wCSNHNF4KVGH1DaL4anPFIQp4L4qQdTJf6/mXZHLub+YPMe3Tn7M8K6dkrbJ61GvVdsUp5UCLoayFHRFOP0U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727266533; c=relaxed/simple; bh=Em0jT0qWs/MOpa/lMUkIpxzfmUGuBUwRUER9vlnIhpo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ABp8qhWBd+iX7VigwwcNl/Nok9LQklNwx5ugsSpi2UzuaR+CluQRE15Idps9K7nA6k2COT8r8TC0D03lmjnKp17STTt6apM95TZJkWhipT+iuMq+NG/0bDXZvwmaKfzzyhnn02zsOXQHOF1cDhZRSekbAMvX0m7A5V7TKMLQ8DA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rCo/Fn2R; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="rCo/Fn2R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 523BDC4CEC3; Wed, 25 Sep 2024 12:15:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727266533; bh=Em0jT0qWs/MOpa/lMUkIpxzfmUGuBUwRUER9vlnIhpo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rCo/Fn2Rg/IINNOCjkIQhQseSHGiGuURw5RMaUy0a12ueKnGs1X/0E+A/p1itS259 4dIQd6Ur8VFz3JYIzgrh605xWv4EKMiuIzpZmtjYMsiV1Eei4RIAc8DSvx/uMzZxIz oMezIDr3piCwZqm3IXLLdV9e6NtarabTmBXVQg3pKLdsqVDD0BKGsN2+0AcSb0komq NatVQTqqI5DEU6hD8WbNXjSwdZSJ0lfKEmQbII4m/pdJloMJel/4SuZxYV0TctMPoV 2/RJUq2Q2y0RJdR2PPq1gzkjB8cRiL0W+1J2uyocRXUbT2lBihSmSRI2aHAjtnOvNX TFwd/gJ3ivBUA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Srinivasan Shanmugam , Tom Chung , Rodrigo Siqueira , Roman Li , Alex Hung , Aurabindo Pillai , Harry Wentland , Hamza Mahfooz , Alex Deucher , Sasha Levin , sunpeng.li@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, alvin.lee2@amd.com, wenjing.liu@amd.com, sungjoon.kim@amd.com, dillon.varone@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.6 087/139] drm/amd/display: Add null check for top_pipe_to_program in commit_planes_for_stream Date: Wed, 25 Sep 2024 08:08:27 -0400 Message-ID: <20240925121137.1307574-87-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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.52 Content-Transfer-Encoding: 8bit From: Srinivasan Shanmugam [ Upstream commit 66d71a72539e173a9b00ca0b1852cbaa5f5bf1ad ] This commit addresses a null pointer dereference issue in the `commit_planes_for_stream` function at line 4140. The issue could occur when `top_pipe_to_program` is null. The fix adds a check to ensure `top_pipe_to_program` is not null before accessing its stream_res. This prevents a null pointer dereference. Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:4140 commit_planes_for_stream() error: we previously assumed 'top_pipe_to_program' could be null (see line 3906) Cc: Tom Chung Cc: Rodrigo Siqueira Cc: Roman Li Cc: Alex Hung Cc: Aurabindo Pillai Cc: Harry Wentland Cc: Hamza Mahfooz Signed-off-by: Srinivasan Shanmugam Reviewed-by: Tom Chung 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 50e643bfdfbad..0b2eb2a6c8e14 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -3797,7 +3797,8 @@ static void commit_planes_for_stream(struct dc *dc, } if ((update_type != UPDATE_TYPE_FAST) && stream->update_flags.bits.dsc_changed) - if (top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) { + if (top_pipe_to_program && + top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) { top_pipe_to_program->stream_res.tg->funcs->wait_for_state( top_pipe_to_program->stream_res.tg, CRTC_STATE_VACTIVE); -- 2.43.0