From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B43654DEC26; Wed, 30 Sep 2026 18:17:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792235; cv=none; b=Ijes745jLoiAdPmc5LVD08cxUipEHe32D3REJkmq9IxLFk+IuusEwBa/qVC2X/FcXLPiaqhMa4Qdl/nkvYvg6Drq0pytlJLotdwjTduL8oNPDKE0CbsIqR6vSdf3rmYe9o2hUw9mORkrXp4dTXtfKDK0suLn3BJYfpasgJpMhsA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792235; c=relaxed/simple; bh=sYssU8eFsdtxmX9n15QJVTYnVKrge011anTzdVJ5M4E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ee8tQgpbMuw90bvqy9L9anDdLw+I+HMPNeD+Z/Ph+RuPI839riEXZmD/98hcgpSPu0jdnn1pBJ8ogHPKlFBwC5YxdfPHyEYtlzOsWa1sQ03mG7mqMCdQ1sbwhvgJKoPxFO3jm1Qb1fWyPIVH5E5wVODLBrY3zHiKPnt8xkdhaKo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ncrBG2vn; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ncrBG2vn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C31121F000FF; Wed, 30 Sep 2026 18:17:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790792234; bh=eRN+Ny9wqN8Jo0mIOqSQ7DoBcpZMrSjX/2h0yaDQUqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ncrBG2vn5j7pglBirzE5jlnTSR1ykEivENFwnsmpKk7nb6NqF/wAthooVwfHHDlA8 KHjDij1EaStgbfjoPCRrbZy2q12OsxZIBhP6sGQEvTAfPg2cYIdsFzVCI57XgRhzgv juapO6FZnv5GWsSyjbRD/ed2MUFN6DOGt4O8VSik= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sashiko , Sajal Gupta , Ruben Wauters Subject: [PATCH 5.15 583/752] drm/gud: fix out-of-bounds write in gud_plane_atomic_check() Date: Wed, 30 Sep 2026 17:27:33 +0200 Message-ID: <20260930152410.908900005@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sajal Gupta commit 59ced288fcba9e91bd38e61a972ad782c4edb7d0 upstream. The plane property loop uses req->properties[num_properties + i] as write index while simultaneously incrementing `num_properties` inside the loop. At iteration i, num_properties has also incremented by i, so the write is done at `initial_num_properties + 2*i`, skipping every other index and advancing by 2 per iteration. With just 2 connector and 32 plane properties the last write happens at index 64, one slot past the end of the 64-slot (indices 0–63) allocation. A USB device can trigger OOB by advertising the maximum number of properties. Fix by dropping the redundant `+ i`; num_properties is already the correct running index, as gud_connector_fill_properties() fills the preceding slots. Fixes: 40e1a70b4aed ("drm: Add GUD USB Display driver") Reported-by: Sashiko Link: https://sashiko.dev/#/patchset/20260821071812.16500-1-sajal2005gupta%40gmail.com?part=1 Signed-off-by: Sajal Gupta Cc: Acked-by: Ruben Wauters Signed-off-by: Ruben Wauters Link: https://patch.msgid.link/20260902123254.36987-1-sajal2005gupta@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/gud/gud_pipe.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/gud/gud_pipe.c +++ b/drivers/gpu/drm/gud/gud_pipe.c @@ -533,8 +533,8 @@ int gud_pipe_check(struct drm_simple_dis goto out; } - req->properties[num_properties + i].prop = cpu_to_le16(prop); - req->properties[num_properties + i].val = cpu_to_le64(val); + req->properties[num_properties].prop = cpu_to_le16(prop); + req->properties[num_properties].val = cpu_to_le64(val); num_properties++; }