From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D9B2CCA470 for ; Wed, 1 Jun 2022 14:11:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238399AbiFAOLy (ORCPT ); Wed, 1 Jun 2022 10:11:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355837AbiFAOG3 (ORCPT ); Wed, 1 Jun 2022 10:06:29 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 883C2BA9A2; Wed, 1 Jun 2022 07:00:09 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1AE46615AA; Wed, 1 Jun 2022 13:59:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4E38C3411F; Wed, 1 Jun 2022 13:59:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654091988; bh=OrmCgyrADCQvNNfgQB2Hra1RezhD/GsfwcYi2XWqsis=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qx2WYyfEvSjso1+bRVg0+9wAELYbrLm4L5crq9NWgkgU7SHjG7jBWKcePZyjqY0Z2 2yWrx1hdkwcRJy120vCvz4CrQcd896prHJUMWiQ9Bg9aU7GmHwhgoIGp5ocKnr6RCA 9LlTzPLtOxR9js1kPztySri6odgvg1bSFwLf4BnvZPuKVk4lkw6Rvjk+cu+h68FmQp 7a0onenWXlJbN1ke5s4QTSCQ7K56WF9p9vJVcPaIM9HEC1JmH1Q6hnWckkSBNIedfC sylwCXymiXYKgtDz7NlV3jOdDeUKJAd97LD0PKqaTUNvIoOlUVZFWa0cJi0htx0Kks 5ydS9fO+AnbLQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Douglas Miller , Dennis Dalessandro , Jason Gunthorpe , Sasha Levin , linux-rdma@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 19/20] RDMA/hfi1: Prevent panic when SDMA is disabled Date: Wed, 1 Jun 2022 09:59:01 -0400 Message-Id: <20220601135902.2004823-19-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220601135902.2004823-1-sashal@kernel.org> References: <20220601135902.2004823-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Douglas Miller [ Upstream commit 629e052d0c98e46dde9f0824f0aa437f678d9b8f ] If the hfi1 module is loaded with HFI1_CAP_SDMA off, a call to hfi1_write_iter() will dereference a NULL pointer and panic. A typical stack frame is: sdma_select_user_engine [hfi1] hfi1_user_sdma_process_request [hfi1] hfi1_write_iter [hfi1] do_iter_readv_writev do_iter_write vfs_writev do_writev do_syscall_64 The fix is to test for SDMA in hfi1_write_iter() and fail the I/O with EINVAL. Link: https://lore.kernel.org/r/20220520183706.48973.79803.stgit@awfm-01.cornelisnetworks.com Signed-off-by: Douglas Miller Signed-off-by: Dennis Dalessandro Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/hw/hfi1/file_ops.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c index 89e1dfd07a1b..8c7ba7bad42b 100644 --- a/drivers/infiniband/hw/hfi1/file_ops.c +++ b/drivers/infiniband/hw/hfi1/file_ops.c @@ -308,6 +308,8 @@ static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from) unsigned long dim = from->nr_segs; int idx; + if (!HFI1_CAP_IS_KSET(SDMA)) + return -EINVAL; idx = srcu_read_lock(&fd->pq_srcu); pq = srcu_dereference(fd->pq, &fd->pq_srcu); if (!cq || !pq) { -- 2.35.1