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 62CC14248DC for ; Tue, 21 Jul 2026 19:48:38 +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=1784663319; cv=none; b=I1dCx8WiDTc4S/NSTZpfP4PdaLdSU4XyyYy7Xw7Zup++IqXmQEgQ1WyUBXpJXe8mMBV+yXe3AtEptF/cEfAe7K+ewx71pdYVPMW/4KZmZW1itIuoQa296ZE3kTSdM32JG1tE3Y7BHTP7q7s6Fk4jvght1ZrXBksrwwjGbIpUyn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784663319; c=relaxed/simple; bh=AyX2CXBwN9Y6JiFfYOlXd7kzzSM1hkohZMw+yLO6XEk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CBi5pJh3o7mm7RRwuddWaG7y2kiMEgSn47VzGeBE4D9ktE86PT/yPu5zc9TZEJ10D0zcrfBkLloe9ZZAPU1GLH73B/X7Js76fpSAGMQFmzvzIvzhAsvRzokBxdE/1oesBwqbuS/9KgwatGBzkuU1MtoMkXJOCdlvJTbfBgHf4N4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gworHBeh; 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="gworHBeh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B69931F000E9; Tue, 21 Jul 2026 19:48:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784663318; bh=qDQnLuNKKHj2/JYQWQGsvti1i7IBHRPdBp0ViYCBM3o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=gworHBehi63OrIHq0GXBavokFDgE20xjFA/fxkgFC/KvFbVcb/iLb5P+bVzWAsR3G MjLn2a2VWTxvA4eTgyeS49xxMMkljLAIIDWYuCww4MPbJOn7XYtzKIKWgewTWbYlyG SOrDPdeqY3DVWD3TtU9+JP+xZc1hLUf1eZLqytWmi2AG4y5KQS4HNxviJRP/SDJcsj bFicns/jYtzP7X1h5BP1UvZcbRyKyuD2oS7AcL1Z/HVV61GXidKQogItjqAldGTaH8 Oip0TLudbjjBRo51xyMWyr4m4S2vRgSmbqWXiCL6afoN5zRszBXWWV4vDBaUYYZnJe vRDlhgck4Nlhg== From: Sasha Levin To: stable@vger.kernel.org Cc: Sebastian Alba Vives , Xu Yilun , Xu Yilun , Sasha Levin Subject: [PATCH 5.15.y] fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() Date: Tue, 21 Jul 2026 15:48:35 -0400 Message-ID: <20260721194835.416843-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026071620-drained-crate-54fa@gregkh> References: <2026071620-drained-crate-54fa@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 7f621e96d3b8d8..dd4107ffa7158c 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