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 05A9615705F; Mon, 29 Jan 2024 17:16:47 +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=1706548607; cv=none; b=tj4Ya2hMMmt166dKxxCzB4SaOd8KvnVkmFSmCWCgM0t4YXD2MCkA2hsN+/1hmBN9k19OXnWnWi/+8gEPzr29KH2iaWemSZr0NcI9Y9iOtqgovUGMzWyioK7AWtyZx+PzNdt5GqWOZmVNjfjyhCEAQVI8DbMLHuJvm7LURxNlwY4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706548607; c=relaxed/simple; bh=NO9d6f55VDaN/5Bw1nRwVnfvejlCIRxgthemD7J7QiA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XEMwd/CrNc6qmI1N6ysdMCtuEBi10Sj7cQ/StpHn/MZdtV5SeFovgl2wIIkUiNFoDXVBTzmDmbnn2JtHvJqZDJvxlwo4Ks8x1O1Ams4hJby1s1K4FyPPamgzoOrRgod/lnKpeOgdAQ4HxIyPQ9Qa00r4nQZ0SWn5GFKQz9lJ+P0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kMITEE5N; 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="kMITEE5N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF946C433C7; Mon, 29 Jan 2024 17:16:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1706548606; bh=NO9d6f55VDaN/5Bw1nRwVnfvejlCIRxgthemD7J7QiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kMITEE5NJOOBVg4OGMdvn86PWeEA5u0jrPZJcHKRSKPKwtLKCYQdHByVdqL7sbMdG zCL2NvECtO/0oX/PgovcdrpShUHxGmwiVeopDc0dzD/2EYGfBCBMiHnXXSHUN3MBtH iL9JReRnAiSlyddH5W3o3hDWhT6Cw9fZHxJ+mT6M= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Aurabindo Pillai , Rodrigo Siqueira , Hamza Mahfooz , Wenjing Liu , Qingqing Zhuo , Srinivasan Shanmugam , Alex Deucher Subject: [PATCH 6.6 270/331] drm/amd/display: Fix late derefrence dsc check in link_set_dsc_pps_packet() Date: Mon, 29 Jan 2024 09:05:34 -0800 Message-ID: <20240129170022.767755506@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240129170014.969142961@linuxfoundation.org> References: <20240129170014.969142961@linuxfoundation.org> User-Agent: quilt/0.67 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: Srinivasan Shanmugam commit 3bb9b1f958c3d986ed90a3ff009f1e77e9553207 upstream. In link_set_dsc_pps_packet(), 'struct display_stream_compressor *dsc' was dereferenced in a DC_LOGGER_INIT(dsc->ctx->logger); before the 'dsc' NULL pointer check. Fixes the below: drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_dpms.c:905 link_set_dsc_pps_packet() warn: variable dereferenced before check 'dsc' (see line 903) Cc: stable@vger.kernel.org Cc: Aurabindo Pillai Cc: Rodrigo Siqueira Cc: Hamza Mahfooz Cc: Wenjing Liu Cc: Qingqing Zhuo Signed-off-by: Srinivasan Shanmugam Reviewed-by: Aurabindo Pillai Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/display/dc/link/link_dpms.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c @@ -873,11 +873,15 @@ bool link_set_dsc_pps_packet(struct pipe { struct display_stream_compressor *dsc = pipe_ctx->stream_res.dsc; struct dc_stream_state *stream = pipe_ctx->stream; - DC_LOGGER_INIT(dsc->ctx->logger); - if (!pipe_ctx->stream->timing.flags.DSC || !dsc) + if (!pipe_ctx->stream->timing.flags.DSC) + return false; + + if (!dsc) return false; + DC_LOGGER_INIT(dsc->ctx->logger); + if (enable) { struct dsc_config dsc_cfg; uint8_t dsc_packed_pps[128];