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 9BAAFFD0049 for ; Sun, 1 Mar 2026 02:02:57 +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=9Bi98EdnTTnVTXGELexBxMTfbc1GAZeQ0+31PKpGBpM=; b=n9kO/d4Eal33xqB5jYsvywIqIP T+V9a2yzE9VwWIO8Z6csg30Hz/hcr1V4xvQqVUG9sD9qbS1164Tq4d8k2uVqbRNKvBlYO0tX0vJCF ashhxko/g4sMTUhDTlkL3HSaLSAyTPO03wAfp3kUSq0blWv6w/TbZKjCGr89WQIcIlPCv1oUiVXO6 87mzchBwVh1HWSavBVArgrGzRC4ZTn2QxWfIHkr2H83TOoAT5gVKhAIAAoAvtlYpPbNTAvHQGJDm3 AfgVykiYuktHhpen7qvfc4GZsOIVtkZ9alVUxi4fDOhYipPoD3GJW92575o0qnRvLoP4mWEkQ7Vl2 GenPRlvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vwW8z-0000000AipE-0LHt; Sun, 01 Mar 2026 02:02:53 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vwW8x-0000000Aip7-2h1r for linux-arm-kernel@lists.infradead.org; Sun, 01 Mar 2026 02:02:51 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 0411D6012B; Sun, 1 Mar 2026 02:02:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 09DCBC19421; Sun, 1 Mar 2026 02:02:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772330570; bh=syPIQXWwhj6eiG9ZKlOOFdyQ/tRTgqffREQT43QIoJs=; h=From:To:Cc:Subject:Date:From; b=PSK+5ArnCNIHrBrrg39YznHx9/OVeJhBhqH+fh4flCxYn0l9w4dpOnxhu+vSNd3Z7 J5NuPen0XAZVhORdNx3+OGpF3mtBDBFDycs4UUe45e0HyY/2lZssK/+LFACrf0VNjL UvFaEHBBDyB13no7EAg6FUg0vokqIILMipD4qMkuQXpgetE7BgWSNGb+nH2in/JsG5 4SOdbgWWAq0QPph+XLAjNSyoY530iRfg9oWCyhuAYioDr6SlaN3p8hABurUvM6y00y uCIG0J0zyi3NMzEcDP7Mv28VaqL9LtUwubeZuegtKmfhCkhbDaNFj25BmUSgdZfkoc VYKz/3U2MRvbw== 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: fix to avoid directly dereferencing user pointer" failed to apply to 5.10-stable tree Date: Sat, 28 Feb 2026 21:02:48 -0500 Message-ID: <20260301020248.1730726-1-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-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 5.10-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 d4c98c077c7fb2dfdece7d605e694b5ea2665085 Mon Sep 17 00:00:00 2001 From: Jeongjun Park Date: Mon, 19 Jan 2026 17:25:52 +0900 Subject: [PATCH] drm/exynos: vidi: fix to avoid directly dereferencing user pointer In vidi_connection_ioctl(), vidi->edid(user pointer) is directly dereferenced in the kernel. This allows arbitrary kernel memory access from the user space, so instead of directly accessing the user pointer in the kernel, we should modify it to copy edid to kernel memory using copy_from_user() and use it. Cc: Signed-off-by: Jeongjun Park Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_drm_vidi.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c index 480c99a8f9f75..9709c07e5d8f4 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c @@ -252,13 +252,27 @@ int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, if (vidi->connection) { const struct drm_edid *drm_edid; - const struct edid *raw_edid; + const void __user *edid_userptr = u64_to_user_ptr(vidi->edid); + void *edid_buf; + struct edid hdr; size_t size; - raw_edid = (const struct edid *)(unsigned long)vidi->edid; - size = (raw_edid->extensions + 1) * EDID_LENGTH; + if (copy_from_user(&hdr, edid_userptr, sizeof(hdr))) + return -EFAULT; - drm_edid = drm_edid_alloc(raw_edid, size); + size = (hdr.extensions + 1) * EDID_LENGTH; + + edid_buf = kmalloc(size, GFP_KERNEL); + if (!edid_buf) + return -ENOMEM; + + if (copy_from_user(edid_buf, edid_userptr, size)) { + kfree(edid_buf); + return -EFAULT; + } + + drm_edid = drm_edid_alloc(edid_buf, size); + kfree(edid_buf); if (!drm_edid) return -ENOMEM; -- 2.51.0