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 X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AEA0C433FE for ; Mon, 20 Sep 2021 18:18:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3320E61A02 for ; Mon, 20 Sep 2021 18:18:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377541AbhITSTU (ORCPT ); Mon, 20 Sep 2021 14:19:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:33078 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358098AbhITSF0 (ORCPT ); Mon, 20 Sep 2021 14:05:26 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AA46763248; Mon, 20 Sep 2021 17:17:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632158267; bh=nbwWSCKy9q4DxA0i5QSHUj+4pyyuSx6dn3R8lNa2nxo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mrr5n0grYkQIppYThBGJ1hketPZXID7/DNr0u2ZgVVX7CtbfsspBpK8j1lm/jA1Qb AmokbLC6G5ZyrUrsP27QKylLFFRxOzKLVBTh/eYMJOEtie8poSteZH4FSmOBjlA3IF MOa2TRY1S2XOj3cLrCVVrIj8+xTX+rx83FxAW8eE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Trond Myklebust , Anna Schumaker , Sasha Levin Subject: [PATCH 5.4 050/260] SUNRPC: Fix potential memory corruption Date: Mon, 20 Sep 2021 18:41:08 +0200 Message-Id: <20210920163932.810824907@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163931.123590023@linuxfoundation.org> References: <20210920163931.123590023@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Trond Myklebust [ Upstream commit c2dc3e5fad13aca5d7bdf4bcb52b1a1d707c8555 ] We really should not call rpc_wake_up_queued_task_set_status() with xprt->snd_task as an argument unless we are certain that is actually an rpc_task. Fixes: 0445f92c5d53 ("SUNRPC: Fix disconnection races") Signed-off-by: Trond Myklebust Signed-off-by: Anna Schumaker Signed-off-by: Sasha Levin --- include/linux/sunrpc/xprt.h | 1 + net/sunrpc/xprt.c | 6 ++++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h index d7ef5b97174c..3c6c4b1dbf1a 100644 --- a/include/linux/sunrpc/xprt.h +++ b/include/linux/sunrpc/xprt.h @@ -419,6 +419,7 @@ void xprt_unlock_connect(struct rpc_xprt *, void *); #define XPRT_CONGESTED (9) #define XPRT_CWND_WAIT (10) #define XPRT_WRITE_SPACE (11) +#define XPRT_SND_IS_COOKIE (12) static inline void xprt_set_connected(struct rpc_xprt *xprt) { diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 639837b3a5d9..3653898f465f 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -729,9 +729,9 @@ void xprt_force_disconnect(struct rpc_xprt *xprt) /* Try to schedule an autoclose RPC call */ if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) queue_work(xprtiod_workqueue, &xprt->task_cleanup); - else if (xprt->snd_task) + else if (xprt->snd_task && !test_bit(XPRT_SND_IS_COOKIE, &xprt->state)) rpc_wake_up_queued_task_set_status(&xprt->pending, - xprt->snd_task, -ENOTCONN); + xprt->snd_task, -ENOTCONN); spin_unlock(&xprt->transport_lock); } EXPORT_SYMBOL_GPL(xprt_force_disconnect); @@ -820,6 +820,7 @@ bool xprt_lock_connect(struct rpc_xprt *xprt, goto out; if (xprt->snd_task != task) goto out; + set_bit(XPRT_SND_IS_COOKIE, &xprt->state); xprt->snd_task = cookie; ret = true; out: @@ -835,6 +836,7 @@ void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie) if (!test_bit(XPRT_LOCKED, &xprt->state)) goto out; xprt->snd_task =NULL; + clear_bit(XPRT_SND_IS_COOKIE, &xprt->state); xprt->ops->release_xprt(xprt, NULL); xprt_schedule_autodisconnect(xprt); out: -- 2.30.2