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 2B5EC46C4BC for ; Tue, 21 Jul 2026 18:49:08 +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=1784659751; cv=none; b=eYxU4hK/wL3JJitr30SHYR15/ZOciP94d9TStY2i9pNU/5HoqEuxyYs7vBBwlg3R+pLIdh8IB9ewONd4XjQZjYfpR4R9kXtcpjqKC1uG5UwDsMoG+e3hC08YtACOY+9eUj05WNttKBADBkUp7GSxtUsc7H5CAoy2kVB/ZqFw5XM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784659751; c=relaxed/simple; bh=v22MGEjiNy9gkJNYAgKDzSf85drG2W0vAn9Ca+TDBqQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nuYmTw2cuyS1BdbJtI6RvzyxWx95uRUQg6OWDzEs0JObVm3IWKcfCAH/1rZ6PWPE9yG5Ry6ZfCz+RiEc91Yx64On8DXlamuqZms4ACtXxjsLuUurcFeoFrUyIlyuXfK5l7WPeMJWtxtaxxSKNMWlDNaE6Cx+VpeVvdrOWg6xavU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aSqiKbWK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aSqiKbWK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B1C41F000E9; Tue, 21 Jul 2026 18:49:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784659748; bh=uReOU+YViBbLxmH4h5CdafqcWcVBHQWtVzHPSSm/oLk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=aSqiKbWKeDpPGpXmA6DNu4GhlGv59Z5MzqRttO4+iYZa7zhq82maw4jVmnCu7uPhz 4QqKZsPuE80dB9ePbis9rCl175msjCxzJXDEuMB3cqHcrpYENFjgGjqbikx1e9Ow8E lzvF6erErcd3a4maB09yxpdZqPI7tbcUNUBXuwEXs1jio/BjacvAgSupXAkUBmGkPt sGPsPpxBzEHn0FOT+ifbhdr/afyaR/6vFkOHcmK2V9mHR9+buauvURzHyS58QINMRp Qd4hJMCrFRFBVVsoGP8LKYezOjNTpbXh0PdWPP+pLRJuxyzmcESZ/iNGUvco0DqaBF RIT06FCzju+IQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Sebastian Alba Vives , Xu Yilun , Xu Yilun , Sasha Levin Subject: [PATCH 6.12.y] fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() Date: Tue, 21 Jul 2026 14:49:06 -0400 Message-ID: <20260721184906.383124-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026071619-replay-composite-2348@gregkh> References: <2026071619-replay-composite-2348@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Sebastian Alba Vives [ Upstream commit fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27 ] afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX. Fixes: fa8dda1edef9 ("fpga: dfl: afu: add DFL_FPGA_PORT_DMA_MAP/UNMAP ioctls support") Cc: stable@vger.kernel.org Signed-off-by: Sebastian Alba Vives Reviewed-by: Xu Yilun Link: https://lore.kernel.org/r/20260518190742.61426-3-sebasjosue84@gmail.com Signed-off-by: Xu Yilun Signed-off-by: Sasha Levin --- drivers/fpga/dfl-afu-main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c index 6b97c073849ea9..89e922d9f6d583 100644 --- a/drivers/fpga/dfl-afu-main.c +++ b/drivers/fpga/dfl-afu-main.c @@ -720,6 +720,9 @@ afu_ioctl_dma_map(struct dfl_feature_platform_data *pdata, void __user *arg) if (map.argsz < minsz || map.flags) return -EINVAL; + if (map.length >> PAGE_SHIFT > (u64)INT_MAX) + return -EINVAL; + ret = afu_dma_map_region(pdata, map.user_addr, map.length, &map.iova); if (ret) return ret; -- 2.53.0