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 65306386571 for ; Tue, 21 Jul 2026 18:59:11 +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=1784660353; cv=none; b=Rrtex8A7y6O/2xegC4v1egQc6XRj38UjrJzy60e4tRNBHacmsa2aNNUoPee4L0R7a0t2ErDnBkbY9g57a26XocAPy218V5Ps2tH4Ca+UR9FZ2RE6vCGfIrnWFCtCbNzgnLMzHybLodwKNJ9WblDby5GrBo13EdEdDQ7tkaj2lis= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784660353; c=relaxed/simple; bh=AyX2CXBwN9Y6JiFfYOlXd7kzzSM1hkohZMw+yLO6XEk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=c/ULKxU55FF9AtOUlPRR3tamEDeVyOlymkmd46Hp190pGi/9esNW0Q3ljNdWfuC0902wsjUWQ+OFPCJkPM7x5bheV+me77XpWOyMN4yb+SnRCssXzlZf6VmBV3TFlzrZYSqG7cne62okhTjXGLsdlgD8cwPBaWiHEHdvDHbFavs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=J+Rg7SeV; 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="J+Rg7SeV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 810501F00A3F; Tue, 21 Jul 2026 18:59:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784660351; bh=qDQnLuNKKHj2/JYQWQGsvti1i7IBHRPdBp0ViYCBM3o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=J+Rg7SeVLUnJAl37QfGyYO8m9GPsm2PkLemTBeqRS344975q75++hlczv+fOfcbyQ HPNvxsPOyJBXSc8CltUUKudwr7OjeIGfP/99TQXqLYqh46d28q88TJxWtcpbAlrnYy eDhQ5sSZyQ8ZvCxTb9rIQ0gXyMLe7hJn7nYyWq1YbC9h7IXnyMEWilzkEKG/V2w+Wt kW28F2aear9qzWkre9iZw9N8tucJ5Bfp+LubEjXhMj/Klrnwe1HQD8ki3D3kNHh1pS Fg1q2jHSsWwgWTUyw43WnjL27lJ56D1qHlyZSTMFC6/UN9ZWoiVX5vh6Z1Yf7pjGDE ZgeYKAQ1dBq+g== From: Sasha Levin To: stable@vger.kernel.org Cc: Sebastian Alba Vives , Xu Yilun , Xu Yilun , Sasha Levin Subject: [PATCH 6.6.y] fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() Date: Tue, 21 Jul 2026 14:59:09 -0400 Message-ID: <20260721185909.397655-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026071619-cannot-evaluate-f3ca@gregkh> References: <2026071619-cannot-evaluate-f3ca@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