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 6FF9C3DA5A3; Wed, 30 Sep 2026 19:19:07 +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=1790795948; cv=none; b=MfdMF8L82p+YdvkYrKmBjM2AxTeMsYzyvyOsji1n4qdfpGBPuVZbPiEIcIN48dgXdwK4fnV+SD/z1BEGDOOFPyWGfpeHGM87Ndzh8o1Z0dq5CfiImWL/ngeYPyZeMsTL8pPPD69PMcLbCj4BWjMbDW6HisreQAj9STYehHycrmk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790795948; c=relaxed/simple; bh=jMavVQy9UNNuYXw5/AueoHbeaRbF0GZ+dlTFoJc5n/w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CvueGQck/TnIe303qgrSArp8HCHxqHMIy/29VSH2Um0xhUnyeKZN8nnpjFrtteW/736Qfa1b1iSUsIci5/5+bHRT3Y+ZpX3Pb78bV9VIFl71eJo0bGpi1HiB4vhNZ8oMpn9ckanI25akLgoAXUHV6GrCPygkiHGMB6qxm1NgBQI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lXX6SIo5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="lXX6SIo5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AAFAB1F000FF; Wed, 30 Sep 2026 19:19:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790795947; bh=3PGv2Xi9l/xXA4Hcoe/1hqzGgAiqLNNmjEu4FJF0zDE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=lXX6SIo5mUvt46YCUeUXuh9UpX14IPNpbYVB+qqy1X+jPUrobl5jCNc+DyhpW2bOO LttHQLkPIF/UiQO3Y0rryQ5AgTOe7+M1CCdrXn2as+Oi1noh+QJP0iYWfSLQ9ExX3F Na8AWMae7XpE3BRV/l7rTFyDiYHd2+VgbvAWL5QU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+d396918a29afb8543e1c@syzkaller.appspotmail.com, Quanye Yang , Jack Wang , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.6 0739/1193] RDMA/rtrs-clt: Fix CQ pool leak when connect is interrupted Date: Wed, 30 Sep 2026 17:23:43 +0200 Message-ID: <20260930152450.669275606@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152434.301151190@linuxfoundation.org> References: <20260930152434.301151190@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Quanye Yang [ Upstream commit 2ae16aaa78b5edc6e6d0904c84fd9cdfb762bcda ] The client borrows shared CQ credits in the ADDR_RESOLVED handler via ib_cq_pool_get(), before the peer is connected. create_cm() can return -ERESTARTSYS from wait_event_interruptible_timeout() without destroying the CM ID. The init_conns() and stop-and-destroy paths then call destroy_con_cq_qp() while cq is still NULL (no PUT) and only afterwards rdma_destroy_id(). CMA serializes the handler against rdma_destroy_id() with handler_mutex, but that does not order the GET against destroy_con_cq_qp(). If ADDR_RESOLVED has already passed the DESTROYING check, it can take con_mutex, GET credits, and then lose the con to kfree. Device unregister later hits WARN_ON(cq->cqe_used) in ib_cq_pool_cleanup(). Set a per-connection flag under con_mutex before CQ/QP teardown so a racing ADDR_RESOLVED cannot borrow credits after teardown has begun. Reported-by: syzbot+d396918a29afb8543e1c@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=d396918a29afb8543e1c Fixes: 3b89e92c2a95 ("RDMA/rtrs: Use new shared CQ mechanism") Signed-off-by: Quanye Yang Link: https://patch.msgid.link/20260830-rdma-rtrs-clt-cq-pool-leak-v1-1-b169434fd3df@proton.me Reviewed-by: Jack Wang Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/ulp/rtrs/rtrs-clt.c | 8 ++++++++ drivers/infiniband/ulp/rtrs/rtrs-clt.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c index 1af2ee8c8ed5e..776f8675308f4 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c @@ -1737,6 +1737,8 @@ static void destroy_con_cq_qp(struct rtrs_clt_con *con) /* * Be careful here: destroy_con_cq_qp() can be called even * create_con_cq_qp() failed, see comments there. + * Caller must set con->destroyed under this lock first so a + * racing ADDR_RESOLVED cannot ib_cq_pool_get() after we PUT/SKIP. */ lockdep_assert_held(&con->con_mutex); rtrs_cq_qp_destroy(&con->c); @@ -1771,6 +1773,10 @@ static int rtrs_rdma_addr_resolved(struct rtrs_clt_con *con) int err; mutex_lock(&con->con_mutex); + if (con->destroyed) { + mutex_unlock(&con->con_mutex); + return -ECONNABORTED; + } err = create_con_cq_qp(con); mutex_unlock(&con->con_mutex); if (err) { @@ -2201,6 +2207,7 @@ static void rtrs_clt_stop_and_destroy_conns(struct rtrs_clt_path *clt_path) break; con = to_clt_con(clt_path->s.con[cid]); mutex_lock(&con->con_mutex); + con->destroyed = true; destroy_con_cq_qp(con); mutex_unlock(&con->con_mutex); destroy_cm(con); @@ -2367,6 +2374,7 @@ static int init_conns(struct rtrs_clt_path *clt_path) if (con->c.cm_id) { stop_cm(con); mutex_lock(&con->con_mutex); + con->destroyed = true; destroy_con_cq_qp(con); mutex_unlock(&con->con_mutex); destroy_cm(con); diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.h b/drivers/infiniband/ulp/rtrs/rtrs-clt.h index f848c0392d982..5ba486bfc7daa 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.h +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.h @@ -75,6 +75,8 @@ struct rtrs_clt_con { unsigned int cpu; struct mutex con_mutex; int cm_err; + /* Set under con_mutex before CQ/QP teardown. */ + bool destroyed; }; /** -- 2.53.0