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 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 AE96DFD004B for ; Sun, 1 Mar 2026 01:24:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=NFWkhSdIXIYkyYU3RxHVuGTNtsQrJZRMrzmLwYdHTuQ=; b=ylA9/1uu0Yl+UUsCyZ3ZBtv7gF jUZd6xFP6XXpUrrvLqJ9F6tk50/idgNw0PWFzl6Lt/CL82aBicmV0eAfSCskZ3KaDQk81CKCNMzfu xpsP2W98GCY9i3uDXb3t2MqWw4EitScJVMce/010IVsdfOIRDmomPMfklKrDdxVzJcS/3nyrVwIHb TRS0KCIf/uNAjf2PmXnrEjFhRXlidkzw38aRuMO8h2GhDJWcVMWskmGuOVqSpTav/OGY0ECMnak4U MkmR6uHK1Vsj2Sjg+ugjxRH59IigreWFE1Iv1SfauRMJeBtqVp5p13s3stuVM97XFwbeSdVKN7RwG /s7FC8mw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vwVYE-0000000AVtV-11iW; Sun, 01 Mar 2026 01:24:54 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vwVYB-0000000AVsS-2Tpf for linux-arm-kernel@lists.infradead.org; Sun, 01 Mar 2026 01:24:52 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 356AF4395E; Sun, 1 Mar 2026 01:24:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DAB0C19421; Sun, 1 Mar 2026 01:24:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772328291; bh=rtX7DyN3bJ2S8o3NgMrm5A8EMI5UyE/WOHCeZzeZPec=; h=From:To:Cc:Subject:Date:From; b=VRg7eBkw3nVv074WKiIvepaHpwYkpBF1NDb+d6dE1BrRnlVaQE+T2sS7TwovfiURr hqJ8eogqGMUZuwLsHOBYyxREOyNXezWBqwEfUVQ279D4TeaiZsUXarUE/+1Oa6qJu4 WQIfVTFxuMBwPpkcPxNLwZQ30zqfC5kumct9vjriDqJYOdnBQvPtxkIPfCGAHeD6fp 2g0D3+ya9T95bHp/ZxOLF0hW6uHPsRCdQddL6nLH34r1ho08erziM4pVlZy1VBCi7l Aa600Vs6Jo4BFdY2Qud4FkoBoTa9kX+a7a8Hm0IwfGFvZqVE+hRlCzUWACqCXWKr7Q r70/Oz5TKEMtA== From: Sasha Levin To: stable@vger.kernel.org, aha310510@gmail.com Cc: Inki Dae , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Subject: FAILED: Patch "drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()" failed to apply to 6.12-stable tree Date: Sat, 28 Feb 2026 20:24:48 -0500 Message-ID: <20260301012449.1681760-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260228_172452_034763_4F3E8528 X-CRM114-Status: GOOD ( 17.66 ) 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 The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From d3968a0d85b211e197f2f4f06268a7031079e0d0 Mon Sep 17 00:00:00 2001 From: Jeongjun Park Date: Mon, 19 Jan 2026 17:25:51 +0900 Subject: [PATCH] drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl() vidi_connection_ioctl() retrieves the driver_data from drm_dev->dev to obtain a struct vidi_context pointer. However, drm_dev->dev is the exynos-drm master device, and the driver_data contained therein is not the vidi component device, but a completely different device. This can lead to various bugs, ranging from null pointer dereferences and garbage value accesses to, in unlucky cases, out-of-bounds errors, use-after-free errors, and more. To resolve this issue, we need to store/delete the vidi device pointer in exynos_drm_private->vidi_dev during bind/unbind, and then read this exynos_drm_private->vidi_dev within ioctl() to obtain the correct struct vidi_context pointer. Cc: Signed-off-by: Jeongjun Park Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 + drivers/gpu/drm/exynos/exynos_drm_vidi.c | 14 +++++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index 23646e55f142c..06c29ff2aac0e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -199,6 +199,7 @@ struct drm_exynos_file_private { struct exynos_drm_private { struct device *g2d_dev; struct device *dma_dev; + struct device *vidi_dev; void *mapping; /* for atomic commit */ diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c index 64c69dd2966ec..480c99a8f9f75 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c @@ -224,9 +224,14 @@ ATTRIBUTE_GROUPS(vidi); int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, struct drm_file *file_priv) { - struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev); + struct exynos_drm_private *priv = drm_dev->dev_private; + struct device *dev = priv ? priv->vidi_dev : NULL; + struct vidi_context *ctx = dev ? dev_get_drvdata(dev) : NULL; struct drm_exynos_vidi_connection *vidi = data; + if (!ctx) + return -ENODEV; + if (!vidi) { DRM_DEV_DEBUG_KMS(ctx->dev, "user data for vidi is null.\n"); @@ -372,6 +377,7 @@ static int vidi_bind(struct device *dev, struct device *master, void *data) { struct vidi_context *ctx = dev_get_drvdata(dev); struct drm_device *drm_dev = data; + struct exynos_drm_private *priv = drm_dev->dev_private; struct drm_encoder *encoder = &ctx->encoder; struct exynos_drm_plane *exynos_plane; struct exynos_drm_plane_config plane_config = { 0 }; @@ -379,6 +385,8 @@ static int vidi_bind(struct device *dev, struct device *master, void *data) int ret; ctx->drm_dev = drm_dev; + if (priv) + priv->vidi_dev = dev; plane_config.pixel_formats = formats; plane_config.num_pixel_formats = ARRAY_SIZE(formats); @@ -424,8 +432,12 @@ static int vidi_bind(struct device *dev, struct device *master, void *data) static void vidi_unbind(struct device *dev, struct device *master, void *data) { struct vidi_context *ctx = dev_get_drvdata(dev); + struct drm_device *drm_dev = data; + struct exynos_drm_private *priv = drm_dev->dev_private; timer_delete_sync(&ctx->timer); + if (priv) + priv->vidi_dev = NULL; } static const struct component_ops vidi_component_ops = { -- 2.51.0