From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f174.google.com (mail-pf1-f174.google.com [209.85.210.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 637C1270EC3 for ; Mon, 30 Mar 2026 16:33:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774888402; cv=none; b=j8s9S/jxQHeO2MKwcGBTzOW/3IgPuGMMldp2iLwGzjDkvUOqdCKhxF/mCM54yzVxLRtOT5JrPUGTcz+G9ZZ2U6PlAypurz74mYX/ZIV2diLEjcwvU2wytpxeZ0GsN9Rj58oFD0iU1MudrBEF2eDQ9YcDPZ9noB8m0VqLHN/Xfv4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774888402; c=relaxed/simple; bh=bGbFMyNnpvCVl+J0fK0MN9STuZl4qNUJD/+cYmD4OpI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lzFqEwL2CtxTDz2VD64YsSSDyZXZ1ognUhzgtMcqlF9qn+WN2xxSxriRSiHnW30f/X4GJqIaR8VmN6F5sxTLMADBGHW0+H/yj0dnak68flNQCImWqVc9ImfID0NwHSNHt3306DLyaCcWAzKCVfV9wZOygFuYanUZRDMcynn48F8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=NeZfhOar; arc=none smtp.client-ip=209.85.210.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="NeZfhOar" Received: by mail-pf1-f174.google.com with SMTP id d2e1a72fcca58-82748257f5fso3082366b3a.1 for ; Mon, 30 Mar 2026 09:33:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774888401; x=1775493201; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=8MhflspkR5aGjRme5EkFXDYWe0+axu7ca+z2U/EdobE=; b=NeZfhOarwK6GEC8IqRuS5PmzQhLLx9Tup3nFB7zj4xMez+K75TIFUEq0xveereSNHR 4su2/rT6ED326uONP4oFMpE2UAS5FaFsz7OLuL92lUX57zIzgeSvJfkL7RQRX1RlWpsU FkNBxHvmtjCbYko11BVepk6Qyxj06jAulx+vNRbwdU4mjnqeSzmlTdKne4bbQkPtsJOM ZnwtDwKChm/e+j6WzGHuMuxON2pOxd/uksr1r+hOkr3WUdfLMhOMEShhFwUAM8w0ZdHn hxd2e2gwhV7Q8kZynI6txCJWdsP2mvy9z50ui8ahlMKHHsRysnJh4dvnhem5rwmS8o7K XxHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774888401; x=1775493201; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=8MhflspkR5aGjRme5EkFXDYWe0+axu7ca+z2U/EdobE=; b=cTxTvSGKyvjbZoD5KN0anmLtsnLXWMMn/n0XKxOiN+ZItuQZB7mq81CEFJ3Wjos+0t YwWaRZz8xH+5PQdKWcJSooS3mZHuub0GKzyPjgCOmYv2WNyCEWXWouYSCdzsDHSTHmWk k+oktx5qk6So7QaF1f3+cFrQVoNs9LZ2Q66ozAGl9OkGf6ZERVHhiHvyn48wDfCZFLMA S+g8IqjKMoW1S+ShlhYcDT6g+iDzbUH5lAFh+cq+W3qwDJNZ8XWSH+vBvdWC9jGwOYuv q5pAnwEDLqoQt/ZzgE2b1thqLk+0Tt0GXolvuOgVq4dhar034TegmWjoTpIsYNdpp7+P 74AQ== X-Forwarded-Encrypted: i=1; AJvYcCUH4dLuB7T+/vrRxnNe8x+wKpEiuAUPFiEc7wmF/phQAyymCDAXbWHhuWLKYipWW1L+FwpYjew=@vger.kernel.org X-Gm-Message-State: AOJu0Yw8lPsdN2efyp7DraeHwYSR4I8R+9ZrJ3vCb9t6ThNRP9tqGBAX QUB8/4/9pzBk7QWheDyQ8kvZI7xfwrq3sDufTXTdRbUvCvmY0UY4i+XC X-Gm-Gg: ATEYQzzWpdIZHwF5lomPOYBngGd9LFcTePMtHfJQCMe4cOtCeOJcgmRajn3BELb6OAu Y69VeX52iU1SU6PfIEvKhyyyZUtvL6mCou7TRP8NFXyNCaxIe0JBSZxDRDz/J0k3ZlIBiw2rvJ6 6tNLZd7AE45xBMNPoy11O5w2AEoxzyUQhQKlkIXYtyWFRBMY9eCXd5R3z55NtPSv6e+jzP9tWJf wp8Lp9U1GPFYYltNbZ3eVtAqYNGF5FYJzhdhzmkN1S3iXcYlze+vj6SQJyo0T9oGdYniPxJaM7A jVeoWc1+X7ApnbKfDZP1hSe1StiCTMa5Aaw/iNHmA5OVdeVc78OYQ7Yt5LuRgp46c4Eqjv0hexL HppAXZ+qE937eihYYdgcnMdMzsyU87ciz+L066WB72KsuJ/80uweWREsBKaQgOGveDrPQ2o07YN JIcy/0pZUw5g/aUbSiJgW8eBMKWWvW66dPyi+4ruKsiH8hd0vr/xLfASv5cXzFbnycyn3T0jbL5 WPIkGbo1CzN X-Received: by 2002:a05:6a00:17a8:b0:824:3ef6:a815 with SMTP id d2e1a72fcca58-82cd623571bmr198850b3a.8.1774888400531; Mon, 30 Mar 2026 09:33:20 -0700 (PDT) Received: from SLSGDTSWING002.tail0ac356.ts.net ([129.126.109.177]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82ca85fc6e9sm9137762b3a.46.2026.03.30.09.33.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 09:33:19 -0700 (PDT) From: Weiming Shi To: Allison Henderson , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, Xiang Mei , Weiming Shi Subject: [PATCH net] rds: ib: reject FRMR registration before IB connection is established Date: Tue, 31 Mar 2026 00:32:38 +0800 Message-ID: <20260330163237.2752440-2-bestswngs@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit rds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data and passes it to rds_ib_reg_frmr() for FRWR memory registration. On a fresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with i_cm_id = NULL because the connection worker has not yet called rds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with RDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses the control message before any connection establishment, allowing rds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the kernel. The existing guard in rds_ib_reg_frmr() only checks for !ic (added in commit 9e630bcb7701), which does not catch this case since ic is allocated early and is always non-NULL once the connection object exists. KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:rds_ib_post_reg_frmr+0x50e/0x920 Call Trace: rds_ib_post_reg_frmr (net/rds/ib_frmr.c:167) rds_ib_map_frmr (net/rds/ib_frmr.c:252) rds_ib_reg_frmr (net/rds/ib_frmr.c:430) rds_ib_get_mr (net/rds/ib_rdma.c:615) __rds_rdma_map (net/rds/rdma.c:295) rds_cmsg_rdma_map (net/rds/rdma.c:860) rds_sendmsg (net/rds/send.c:1363) ____sys_sendmsg do_syscall_64 Add a check in rds_ib_get_mr() that verifies ic, i_cm_id, and qp are all non-NULL before proceeding with FRMR registration, mirroring the guard already present in rds_ib_post_inv(). Return -ENODEV when the connection is not ready, which the existing error handling in rds_cmsg_send() converts to -EAGAIN for userspace retry and triggers rds_conn_connect_if_down() to start the connection worker. Fixes: 1659185fb4d0 ("RDS: IB: Support Fastreg MR (FRMR) memory registration mode") Reported-by: Xiang Mei Signed-off-by: Weiming Shi --- net/rds/ib_rdma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index 077f7041df155..2cfec252eeac2 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -604,8 +604,13 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, return ibmr; } - if (conn) + if (conn) { ic = conn->c_transport_data; + if (!ic || !ic->i_cm_id || !ic->i_cm_id->qp) { + ret = -ENODEV; + goto out; + } + } if (!rds_ibdev->mr_8k_pool || !rds_ibdev->mr_1m_pool) { ret = -ENODEV; -- 2.43.0