From patchwork Tue Sep 27 05:25:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhijian Li (Fujitsu)" X-Patchwork-Id: 12989871 X-Patchwork-Delegate: jgg@ziepe.ca 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 9A3D7C54EE9 for ; Tue, 27 Sep 2022 05:26:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229761AbiI0F0q (ORCPT ); Tue, 27 Sep 2022 01:26:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229728AbiI0F0p (ORCPT ); Tue, 27 Sep 2022 01:26:45 -0400 X-Greylist: delayed 63 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 26 Sep 2022 22:26:43 PDT Received: from esa3.hc1455-7.c3s2.iphmx.com (esa3.hc1455-7.c3s2.iphmx.com [207.54.90.49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2436476755; Mon, 26 Sep 2022 22:26:42 -0700 (PDT) X-IronPort-AV: E=McAfee;i="6500,9779,10482"; a="90090448" X-IronPort-AV: E=Sophos;i="5.93,348,1654527600"; d="scan'208";a="90090448" Received: from unknown (HELO oym-r2.gw.nic.fujitsu.com) ([210.162.30.90]) by esa3.hc1455-7.c3s2.iphmx.com with ESMTP; 27 Sep 2022 14:25:37 +0900 Received: from oym-m2.gw.nic.fujitsu.com (oym-nat-oym-m2.gw.nic.fujitsu.com [192.168.87.59]) by oym-r2.gw.nic.fujitsu.com (Postfix) with ESMTP id 441F3D4323; Tue, 27 Sep 2022 14:25:36 +0900 (JST) Received: from kws-ab1.gw.nic.fujitsu.com (kws-ab1.gw.nic.fujitsu.com [192.51.206.11]) by oym-m2.gw.nic.fujitsu.com (Postfix) with ESMTP id 6D77DBF3E3; Tue, 27 Sep 2022 14:25:35 +0900 (JST) Received: from FNSTPC.g08.fujitsu.local (unknown [10.167.226.45]) by kws-ab1.gw.nic.fujitsu.com (Postfix) with ESMTP id 7EF2B11403D7; Tue, 27 Sep 2022 14:25:34 +0900 (JST) From: Li Zhijian To: zyjzyj2000@gmail.com, jgg@ziepe.ca, leon@kernel.org, linux-rdma@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Li Zhijian , Bob Pearson Subject: [PATCH jgg-for-next] RDMA/rxe: Fix pd refcount_t: underflow; use-after-free Date: Tue, 27 Sep 2022 13:25:30 +0800 Message-Id: <20220927052530.21397-1-lizhijian@fujitsu.com> X-Mailer: git-send-email 2.36.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSS-9.1.0.1408-9.0.0.1002-27166.005 X-TM-AS-User-Approved-Sender: Yes X-TMASE-Version: IMSS-9.1.0.1408-9.0.1002-27166.005 X-TMASE-Result: 10-0.495300-10.000000 X-TMASE-MatchedRID: Qgrh8rFiqFSlTHNxJDwdpM36paW7ZnFoUdPVQTIo4RLfUY2boz4kpOgU rKBxousFHeLURnkZ9/50fjyPLAxbIArdexLvyJVkOjf3A4DTYuFN8rmPQRlvK/XGsfmQor+uP0E ECAycyB4i+t+0AiFaYvL3NxFKQpq18gFf6MN9caueAiCmPx4NwJuJ+Pb8n/VxSnQ4MjwaO9cqtq 5d3cxkNZKQ2nSmoAeRxuKRNK6+2Pw/kRCYiDjRDeiecGk1ifHvKQeLuRDovJbv4XJedG181T7Wz GfzeXJkt1UGZw1E8niazv5f7A5SCRiKAP5Y7TkhFcUQf3Yp/ridO0/GUi4gFb0fOPzpgdcEKeJ/ HkAZ8Is= X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org In the error path, both rxe_put(pd) and rxe_cleanup(mr) will drop pd's ref_cont. rxe_cleanup(mr) -> __rxe_cleanup -> rxe_put(mr->elem) -> rxe_mr_cleanup(mr) -> rxe_put(mr_pd(mr)) [342431.583189] ------------[ cut here ]------------ [342431.585051] refcount_t: underflow; use-after-free. [342431.586677] WARNING: CPU: 0 PID: 660500 at lib/refcount.c:28 refcount_warn_saturate+0xcd/0x120 [342431.605247] RIP: 0010:refcount_warn_saturate+0xcd/0x120 [342431.661981] __rxe_cleanup+0x1c3/0x1e0 [rdma_rxe] [342431.663260] rxe_dealloc_pd+0x16/0x20 [rdma_rxe] [342431.664883] ib_dealloc_pd_user+0x95/0xd0 [ib_core] [342431.666803] destroy_hw_idr_uobject+0x46/0x90 [ib_uverbs] [342431.668514] uverbs_destroy_uobject+0xc8/0x360 [ib_uverbs] [342431.670232] __uverbs_cleanup_ufile+0x157/0x210 [ib_uverbs] [342431.671920] ? uverbs_destroy_uobject+0x360/0x360 [ib_uverbs] CC: Bob Pearson Fixes: 0d0e4b528c3b ("RDMA/rxe: Set pd early in mr alloc routines") Signed-off-by: Li Zhijian --- I have to say i made a mistake in previous review, I missed this WARN_ONCE messages. And the V6 patch that i had applied fix this problem in another way. --- drivers/infiniband/sw/rxe/rxe_verbs.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c index 933277d67b7c..88825edc7dce 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.c +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -939,7 +939,6 @@ static struct ib_mr *rxe_reg_user_mr(struct ib_pd *ibpd, return &mr->ibmr; err3: - rxe_put(pd); rxe_cleanup(mr); err2: return ERR_PTR(err); @@ -974,7 +973,6 @@ static struct ib_mr *rxe_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type, return &mr->ibmr; err2: - rxe_put(pd); rxe_cleanup(mr); err1: return ERR_PTR(err);