From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from air.basealt.ru (air.basealt.ru [193.43.8.18]) (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 AA5DA3BE646 for ; Tue, 21 Apr 2026 13:30:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.43.8.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776778206; cv=none; b=i/pir33QP+GpE6AuLtLJn2xSpxwWT39kUhN6U7eRUmGf/EpbZnOMAUL3xSZ6tu70cwNV+na8TEj7eYkkgYdcFoBCBqKFWghUVpOyFZEiUME0h5t0X+ApVueIxthT5PpSxu+7JYFX6AU72yFW/rfpzSXHdCScJHn5DAfntGW+s5c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776778206; c=relaxed/simple; bh=Veq9n+UowMN5zPt7hh5BjrQAvyXUrQJ5BwnydxVG47Y=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=HDChsEOgJpPQHExRL1KgTnGuSSC2pVNB2WBPwYUBHgQEHRes4Rlw7d/0mGZFqg5cyDMSW67IJOLIMRkQiAiH+bWaCF2VwuqibV4IrGTpxL5/J1Kx/kh6lyDgCi13702bijkB6ncsnWnkenvBjIpPOrat0yRhKPbMcP3g262ef5M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=altlinux.org; spf=pass smtp.mailfrom=altlinux.org; arc=none smtp.client-ip=193.43.8.18 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=altlinux.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=altlinux.org Received: from altlinux.ipa.basealt.ru (unknown [193.43.11.2]) (Authenticated sender: kovalevvv) by air.basealt.ru (Postfix) with ESMTPSA id 470172338E; Tue, 21 Apr 2026 16:30:03 +0300 (MSK) From: Vasiliy Kovalev To: stable@vger.kernel.org Cc: Alex Deucher , Harry Wentland , Hamza Mahfooz , amd-gfx@lists.freedesktop.org, lvc-project@linuxtesting.org, kovalev@altlinux.org Subject: [PATCH 5.10.y] drm/amd/display: Add null checker before passing variables Date: Tue, 21 Apr 2026 16:30:02 +0300 Message-Id: <20260421133002.38794-1-kovalev@altlinux.org> X-Mailer: git-send-email 2.33.8 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Alex Hung commit 8092aa3ab8f7b737a34b71f91492c676a843043a upstream. Checks null pointer before passing variables to functions. This fixes 3 NULL_RETURNS issues reported by Coverity. Reviewed-by: Harry Wentland Acked-by: Hamza Mahfooz Signed-off-by: Alex Hung Signed-off-by: Alex Deucher Fixes: cdaae8371aa9 ("drm/amd/display: Handle GPU reset for DC block") Fixes: dcd5fb82ffb4 ("drm/amd/display: Fix reference counting for struct dc_sink.") Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)") [ kovalev: bp to fix CVE-2024-43902; added Fixes tags ] Signed-off-by: Vasiliy Kovalev --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index c22783b88206..bd15de4dee75 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1778,7 +1778,8 @@ static int dm_suspend(void *handle) mutex_lock(&dm->dc_lock); dm->cached_dc_state = dc_copy_state(dm->dc->current_state); - dm_gpureset_toggle_interrupts(adev, dm->cached_dc_state, false); + if (dm->cached_dc_state) + dm_gpureset_toggle_interrupts(adev, dm->cached_dc_state, false); amdgpu_dm_commit_zero_streams(dm->dc); @@ -5396,7 +5397,8 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector) aconnector->dc_sink = aconnector->dc_link->local_sink ? aconnector->dc_link->local_sink : aconnector->dc_em_sink; - dc_sink_retain(aconnector->dc_sink); + if (aconnector->dc_sink) + dc_sink_retain(aconnector->dc_sink); } } @@ -6575,7 +6577,8 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector) drm_add_modes_noedid(connector, 640, 480); } else { amdgpu_dm_connector_ddc_get_modes(connector, edid); - amdgpu_dm_connector_add_common_modes(encoder, connector); + if (encoder) + amdgpu_dm_connector_add_common_modes(encoder, connector); } amdgpu_dm_fbc_init(connector); -- 2.50.1