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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 228FBC4332F for ; Sun, 18 Dec 2022 16:08:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231300AbiLRQIj (ORCPT ); Sun, 18 Dec 2022 11:08:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231449AbiLRQGc (ORCPT ); Sun, 18 Dec 2022 11:06:32 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A361CE1F; Sun, 18 Dec 2022 08:04:23 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id AA57060DB4; Sun, 18 Dec 2022 16:04:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30213C433F1; Sun, 18 Dec 2022 16:04:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1671379462; bh=ai9Dl+ViSUHNRfzUgoHRUybCXR2fgv0q8wVs0578jWo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=InLn0UQe8kW7+PaaFiR7dNLOyAHZXk4CQpBfQy8nk4GE3TkoJv7ma+veDBy4Heo30 JneMXkt0/RMHegiDkKeJGfAWFWdpFNzvDpEqi6jfBzOMBTLUkobFnBbSeyq6APG3Vj VB82xwcONCQd8rmo2EY1u2iaHF8ATTFSZk33ERQJ/nQUoWqmvFEjklBx5UM511CuPo WmJJ8BWDO9yiC0OvrcQDyN25b2ZCR1Vf7ORg5HE0JvXowZIMALSd8tv6HEh9PgP7me MiKYRZV/UurWwpc8tIwmNCN71jKWtUKECf4kb6M4pF8W9sYwtZCw11rL5fOwmUzp2l To+gGqUSQP0LQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Alain Volmat , Daniel Vetter , Sasha Levin , airlied@gmail.com, daniel@ffwll.ch, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.1 40/85] drm/sti: Use drm_mode_copy() Date: Sun, 18 Dec 2022 11:00:57 -0500 Message-Id: <20221218160142.925394-40-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221218160142.925394-1-sashal@kernel.org> References: <20221218160142.925394-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ville Syrjälä [ Upstream commit 442cf8e22ba25a77cb9092d78733fdbac9844e50 ] struct drm_display_mode embeds a list head, so overwriting the full struct with another one will corrupt the list (if the destination mode is on a list). Use drm_mode_copy() instead which explicitly preserves the list head of the destination mode. Even if we know the destination mode is not on any list using drm_mode_copy() seems decent as it sets a good example. Bad examples of not using it might eventually get copied into code where preserving the list head actually matters. Obviously one case not covered here is when the mode itself is embedded in a larger structure and the whole structure is copied. But if we are careful when copying into modes embedded in structures I think we can be a little more reassured that bogus list heads haven't been propagated in. @is_mode_copy@ @@ drm_mode_copy(...) { ... } @depends on !is_mode_copy@ struct drm_display_mode *mode; expression E, S; @@ ( - *mode = E + drm_mode_copy(mode, &E) | - memcpy(mode, E, S) + drm_mode_copy(mode, E) ) @depends on !is_mode_copy@ struct drm_display_mode mode; expression E; @@ ( - mode = E + drm_mode_copy(&mode, &E) | - memcpy(&mode, E, S) + drm_mode_copy(&mode, E) ) @@ struct drm_display_mode *mode; @@ - &*mode + mode Cc: Alain Volmat Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20221107192545.9896-8-ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter Signed-off-by: Sasha Levin --- drivers/gpu/drm/sti/sti_dvo.c | 2 +- drivers/gpu/drm/sti/sti_hda.c | 2 +- drivers/gpu/drm/sti/sti_hdmi.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/sti/sti_dvo.c b/drivers/gpu/drm/sti/sti_dvo.c index b6ee8a82e656..f3a5616b7daf 100644 --- a/drivers/gpu/drm/sti/sti_dvo.c +++ b/drivers/gpu/drm/sti/sti_dvo.c @@ -288,7 +288,7 @@ static void sti_dvo_set_mode(struct drm_bridge *bridge, DRM_DEBUG_DRIVER("\n"); - memcpy(&dvo->mode, mode, sizeof(struct drm_display_mode)); + drm_mode_copy(&dvo->mode, mode); /* According to the path used (main or aux), the dvo clocks should * have a different parent clock. */ diff --git a/drivers/gpu/drm/sti/sti_hda.c b/drivers/gpu/drm/sti/sti_hda.c index 03cc401ed593..ec6656b9ee7c 100644 --- a/drivers/gpu/drm/sti/sti_hda.c +++ b/drivers/gpu/drm/sti/sti_hda.c @@ -524,7 +524,7 @@ static void sti_hda_set_mode(struct drm_bridge *bridge, DRM_DEBUG_DRIVER("\n"); - memcpy(&hda->mode, mode, sizeof(struct drm_display_mode)); + drm_mode_copy(&hda->mode, mode); if (!hda_get_mode_idx(hda->mode, &mode_idx)) { DRM_ERROR("Undefined mode\n"); diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c index cb82622877d2..fcc2194869d6 100644 --- a/drivers/gpu/drm/sti/sti_hdmi.c +++ b/drivers/gpu/drm/sti/sti_hdmi.c @@ -941,7 +941,7 @@ static void sti_hdmi_set_mode(struct drm_bridge *bridge, DRM_DEBUG_DRIVER("\n"); /* Copy the drm display mode in the connector local structure */ - memcpy(&hdmi->mode, mode, sizeof(struct drm_display_mode)); + drm_mode_copy(&hdmi->mode, mode); /* Update clock framerate according to the selected mode */ ret = clk_set_rate(hdmi->clk_pix, mode->clock * 1000); -- 2.35.1