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 2B33E26D4F9; Sun, 1 Mar 2026 01:53:01 +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=1772329981; cv=none; b=Ii53Oo1ww36b8T0NFbml7yI1amJZ+2v8SdjzpI/8nGyboVYhF0MbqIdyZD6jrA1E1IpsqUCdIDwJknOf5GBqqjMiOKN6JWkKQrHKnGWgCrkQ8ZkvT8IIm+dgpnb6YfmOOAEqe/XyBrclUPsfz3fBcT5cEx89mmZumnAXtkSiw6o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329981; c=relaxed/simple; bh=dRiM/jMq63CqjnghMz7kY/a3is23bLOBjy69MzwgtEY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=pKl8PhRYGl5B6WlqdCZQ5uEd6HVLrApXnpPbyQomYLumhuTOFqv4si1wLvonr5q/TfkI+MiLqh/kl6cUJh2fQp6WyAzQEZ4AOf4oZNzG442pQ66RyWq/c6tPMJq72b1qlngLfMMsbZIGr405VOHQFtpgFBzYKhL6/1lrkYK4jt0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RipAhqhE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RipAhqhE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 647C3C19421; Sun, 1 Mar 2026 01:53:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329981; bh=dRiM/jMq63CqjnghMz7kY/a3is23bLOBjy69MzwgtEY=; h=From:To:Cc:Subject:Date:From; b=RipAhqhEjPRebsUg5qOMbOkms2XbdcDTfDj0v38aTueHVmnSMNogaS1drjMgFDMyh c1Vn6RdrfYFq7RvJg7UcLwkI3ZkzxFWgecWXWvuLy0eoCvfMMDU7PrXg1je6Mc4sYY cZY7AqXIQyKrMLR4DDreN59aF/1In5g1tl5fW7rpysdQ834A4SUyI+j/eAhkEVWdsi DsgEPlGDX8ziTFdClEjL8qi15ImnAdT8BDQsT3ckYFy0WJmyUy/IGhvimuJwCIEEDL 9tPGR/IVYnKc2t5P2hy5iHkO8yf2gwxRVlgcHoYjcQ7UX1UA88glpJk6bVoX4qL9gA IJcUX3f9V36Sw== 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 5.15-stable tree Date: Sat, 28 Feb 2026 20:52:58 -0500 Message-ID: <20260301015259.1719632-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-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