From patchwork Fri Aug 9 08:31:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "liujian (CE)" X-Patchwork-Id: 13758545 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (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 0C28D18FDB4; Fri, 9 Aug 2024 08:34:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.190 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723192447; cv=none; b=jw5I76rBsXAgdBn/mFCqv/vXoCuvlTeoBc2YLVWojOpM3JFkgpdElaZHCo25Vor7d7AkEqMvINhyE8k+mNEq9NAiGomA44AOsqirqhSJEl9QlaN8gwq6TBzpjfgn9uZPXCD2ACbVk8RqanEQWPmH4XI6+EpcAhILhK0xFRMLuHg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723192447; c=relaxed/simple; bh=o7zdzIMEvYJzAUMY8b9aGmbbDq1Bj6B6JV3A0LMKWTk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=d16th4fZUqal1jP1GfAGxdOBDM5LWNDsHFYHQOpP510nlWVvnv61wwkilEEE6xpIAzVtATpy1+mnJV3vuqlvZCqZICm/Y9O2RXtL79VeXdJ8OOMGnyvtAwElg7oK7mwJMRcWHdBoAP7eWcJEy0hp9fJsbUkOtDJlt4vPUtHDxiw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.190 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.112]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4WgHC14zQgz20lHB; Fri, 9 Aug 2024 16:29:33 +0800 (CST) Received: from kwepemg200003.china.huawei.com (unknown [7.202.181.30]) by mail.maildlp.com (Postfix) with ESMTPS id 113DF1400F4; Fri, 9 Aug 2024 16:34:02 +0800 (CST) Received: from huawei.com (10.175.101.6) by kwepemg200003.china.huawei.com (7.202.181.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 9 Aug 2024 16:34:00 +0800 From: Liu Jian To: , , CC: , , , , , , , , , , , , Subject: [PATCH net-next 3/4] net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() Date: Fri, 9 Aug 2024 16:31:47 +0800 Message-ID: <20240809083148.1989912-4-liujian56@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240809083148.1989912-1-liujian56@huawei.com> References: <20240809083148.1989912-1-liujian56@huawei.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemg200003.china.huawei.com (7.202.181.30) BUG: kernel NULL pointer dereference, address: 0000000000000238 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 3 PID: 289 Comm: kworker/3:1 Kdump: loaded Tainted: G OE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 Workqueue: smc_hs_wq smc_listen_work [smc] RIP: 0010:dma_need_sync+0x5/0x60 ... Call Trace: ? dma_need_sync+0x5/0x60 ? smc_ib_is_sg_need_sync+0x61/0xf0 [smc] smcr_buf_map_link+0x24a/0x380 [smc] __smc_buf_create+0x483/0xb10 [smc] smc_buf_create+0x21/0xe0 [smc] smc_listen_work+0xf11/0x14f0 [smc] ? smc_tcp_listen_work+0x364/0x520 [smc] process_one_work+0x18d/0x3f0 worker_thread+0x304/0x440 kthread+0xe4/0x110 ret_from_fork+0x47/0x70 ret_from_fork_asm+0x1a/0x30 If the software RoCE device is used, ibdev->dma_device is a null pointer. As a result, the problem occurs. Null pointer detection is added to prevent problems. Signed-off-by: Liu Jian Reviewed-by: Wen Gu Reviewed-by: Dust Li --- net/smc/smc_ib.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index 382351ac9434..059822cc3fde 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -748,6 +748,8 @@ bool smc_ib_is_sg_need_sync(struct smc_link *lnk, buf_slot->sgt[lnk->link_idx].nents, i) { if (!sg_dma_len(sg)) break; + if (!lnk->smcibdev->ibdev->dma_device) + break; if (dma_need_sync(lnk->smcibdev->ibdev->dma_device, sg_dma_address(sg))) { ret = true;