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 3AFD443C7DD for ; Tue, 21 Jul 2026 23:58:33 +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=1784678315; cv=none; b=sdNpz1Itzsjl5OZyxQ+HaMZVfTQ2ow0zkZ6vD0SmNnRKfpq6m5YsV6d/JiV7ZdpTwcWUvqjQkd9mmZURrav+lmNINuWVEQjs4oMsnIAb0Y0lP11zWM9apiT+Ev+I9EFqpSZgd0KwT4vV0LLMUA6km6sbKP5VSXolug1HUyyEApE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784678315; c=relaxed/simple; bh=/SB10XwRoVzaJzPA5veraaulAskH9QW6xOE9PqOlWZQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q+lt474xrbtzKvCAZKbUajVlsatPVrK06Tj7AnWfNpTTc0nMQvgMXFfOaF+uA33Oo65esdKqkcJFhotuVN/ky+m8st35lpnHRiGsc6tu5ZaVA2KzxR7WLsR7h5lhyD7h3euISoah1R5P33CQnPZjDQIePx2LZ8vd6tSV+UzLwW4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UINfonl+; 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="UINfonl+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4795E1F000E9; Tue, 21 Jul 2026 23:58:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784678313; bh=cd686CzUgRxiJy6GlcHXkOb4NEVKj7JToHXmlx5wcDo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UINfonl++L4WB+NeJQK5jYHts5IfCRhbfV6sFeKiA7MqS23/sCQouKrFE43/oYb+R o9+WS9GDfDstNqvDK3s0Ab9ULxq4Ee1fPD58NVm78vDNLYQq2wsMki2GsET1NIgoCp vB6q6coS6TTgwGm0rkrQCPxjSOAKPw/+pKzhiT02EhokLfDPrPMfkXJaKb8uV59OIa YttZi1r/yoBtWffuIMsGDgi/39sqTkahQc06ge7xaFMj/jyySty8Vs+p8Nshh4iESt b3SaEhEAqmTNNfhhSvMh25hnv16rT6u/iaz9dmlK2BSdSlhLs9L73eXN/hcs3s6TPU bK3o2ku7l2OqA== From: Sasha Levin To: stable@vger.kernel.org Cc: Sebastian Alba Vives , Xu Yilun , Xu Yilun , Sasha Levin Subject: [PATCH 5.10.y] fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() Date: Tue, 21 Jul 2026 19:58:31 -0400 Message-ID: <20260721235831.523583-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026071620-thieving-ferret-56cb@gregkh> References: <2026071620-thieving-ferret-56cb@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 753cda4b256838..b85e0624ab8f95 100644 --- a/drivers/fpga/dfl-afu-main.c +++ b/drivers/fpga/dfl-afu-main.c @@ -707,6 +707,9 @@ 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