From patchwork Wed Dec 28 14:42:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 13083082 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 095E0C4708E for ; Wed, 28 Dec 2022 16:51:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=XhdI9EyP0SkTv92OYKcxnl9tDE+R70BnW1tokBtSciA=; b=Y8jUm+4EQAlZj5 sK83TaXCgHjme+wcbiYEEHwuz3clEK5cL9kvxuGoFs3/7bMAJTuo1oQ4zDaSbLlx3XwHQicRGi1wx 8LFpA33PHQEYfAajOwCiWnSsbgMgbhf1OnGSNiKonL/Y3CUy4YgZRkp09gZmnfsQETNt1VlDndywU X7p28S0uVxeLmdqQcFLl9m7w1e/v58wRe1UZxh2HD36wFOpghAUqPWqct2W0FJeMCMF/XSYJ4FPWH zIxebuMdJSy9LeWRFOgpif+/h2ztEoP7GpxOqIFUtyXRFvUxooqzBAJRVDzv762wepyQVpLElOt05 h4MoPCuXDiuUL2aADraQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pAZdC-006VWv-9W; Wed, 28 Dec 2022 16:50:18 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pAZd6-006VUB-Tm; Wed, 28 Dec 2022 16:50:14 +0000 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 792116156C; Wed, 28 Dec 2022 16:50:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82131C433EF; Wed, 28 Dec 2022 16:50:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672246211; bh=nUSiROIuywcjFmshTbQQuHbfp+Kk9J/uXgecjOrgqXc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=haB4fgICIv4nIId+fDbtmXRrEqEK8W7kB7rTR3C5t/O3RN014ClIcilOpgaCzKGNm hDuN/zeUrRIoa0J/XtnFf3MXwJJ4xb06q0+NPEsGHwl5ypAGR7iVeeVasqsnJ4AiYs pYWYPgvMowfm7NBBIA2Z5ru7Dj+1pyVKknCGHIs8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, Daniel Vetter , Sasha Levin Subject: [PATCH 6.1 1003/1146] drm/rockchip: Use drm_mode_copy() Date: Wed, 28 Dec 2022 15:42:22 +0100 Message-Id: <20221228144357.613090753@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144330.180012208@linuxfoundation.org> References: <20221228144330.180012208@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221228_085013_200675_F586FF4D X-CRM114-Status: GOOD ( 17.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ville Syrjälä [ Upstream commit 2bfaa28000d2830d3209161a4541cce0660e1b84 ] 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 Signed-off-by: Ville Syrjälä Cc: Sandy Huang Cc: "Heiko Stübner" Cc: linux-arm-kernel@lists.infradead.org Cc: linux-rockchip@lists.infradead.org Link: https://patchwork.freedesktop.org/patch/msgid/20221107192545.9896-7-ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter Signed-off-by: Sasha Levin --- drivers/gpu/drm/rockchip/cdn-dp-core.c | 2 +- drivers/gpu/drm/rockchip/inno_hdmi.c | 2 +- drivers/gpu/drm/rockchip/rk3066_hdmi.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c index 518ee13b1d6f..8526dda91931 100644 --- a/drivers/gpu/drm/rockchip/cdn-dp-core.c +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c @@ -571,7 +571,7 @@ static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder, video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC); video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC); - memcpy(&dp->mode, adjusted, sizeof(*mode)); + drm_mode_copy(&dp->mode, adjusted); } static bool cdn_dp_check_link_status(struct cdn_dp_device *dp) diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c index 87b2243ea23e..f51774866f41 100644 --- a/drivers/gpu/drm/rockchip/inno_hdmi.c +++ b/drivers/gpu/drm/rockchip/inno_hdmi.c @@ -499,7 +499,7 @@ static void inno_hdmi_encoder_mode_set(struct drm_encoder *encoder, inno_hdmi_setup(hdmi, adj_mode); /* Store the display mode for plugin/DPMS poweron events */ - memcpy(&hdmi->previous_mode, adj_mode, sizeof(hdmi->previous_mode)); + drm_mode_copy(&hdmi->previous_mode, adj_mode); } static void inno_hdmi_encoder_enable(struct drm_encoder *encoder) diff --git a/drivers/gpu/drm/rockchip/rk3066_hdmi.c b/drivers/gpu/drm/rockchip/rk3066_hdmi.c index cf2cf51091a3..90145ad96984 100644 --- a/drivers/gpu/drm/rockchip/rk3066_hdmi.c +++ b/drivers/gpu/drm/rockchip/rk3066_hdmi.c @@ -395,7 +395,7 @@ rk3066_hdmi_encoder_mode_set(struct drm_encoder *encoder, struct rk3066_hdmi *hdmi = encoder_to_rk3066_hdmi(encoder); /* Store the display mode for plugin/DPMS poweron events. */ - memcpy(&hdmi->previous_mode, adj_mode, sizeof(hdmi->previous_mode)); + drm_mode_copy(&hdmi->previous_mode, adj_mode); } static void rk3066_hdmi_encoder_enable(struct drm_encoder *encoder)