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 3155F357D1D; Sat, 12 Sep 2026 19:06:50 +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=1789240011; cv=none; b=cmfzgHxnPY8uukjKMab+h9luKr0Mf3rMgmHq4KNL3zSJobCyFBQvttToNvyqvr+QmihMR32DhpNYyYjDcZDA8YD6vCIC/KvcgN3XzLu5FjzyK83gXyM4gaoQ2vKUSNbCbOyHlF+RDavQwYo18FgHr1RFZ6LVPTbphAMsvEm1FmU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789240011; c=relaxed/simple; bh=GflDdAqOuVTF+59Tywr1BcqXlAINvYIh2HjEG42QmRc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=B5zdCr6izLutFb9MAu2+WV1Gak+8Ow1X7JHSpfJ1i5triHGkYNOyAscaXQ1jpK8LhNR30E6bqAWu+RcuU+HVNOSBr2SqZhuhhZBEePeydB7mLjcUEVeS71Lrm1FomSQMLoWynMSot5PiEyFyS0qTv1L4+nNR+YstBSC8TJckJY8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ldQhZFZV; 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="ldQhZFZV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F0C81F000FF; Sat, 12 Sep 2026 19:06:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789240010; bh=uHImrVs6vmHg5gmQs5QVlCw9LR7qT9XFwtBD/mbszGU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ldQhZFZVrqWtjK7gUmCOYTNZAghOIbck44lqyvXXPvTU3VACY7Yt5fI3mY7Lg7i4l ZKWdDcgUbEh+alIIJeqCDzVKr4AaFpG8KvNVQe4As83aGE93PMonE2OoP0M4jFh8OA 7+l90bT28jxhoUpyqTImFjs0fbVkNhOvfTpPLhxE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+72eddfbadda3e3928e72@syzkaller.appspotmail.com, Zhu Yanjun , Jason Gunthorpe , Sasha Levin Subject: [PATCH 5.15 782/935] RDMA/cma: Fix WARNING in res_to_rt Date: Sat, 12 Sep 2026 09:03:32 +0200 Message-ID: <20260912065544.763948437@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhu Yanjun [ Upstream commit c6d1ec4fbe56492bb88987d577f04a5fb6955f26 ] syzbot reported a WARN_ON(!res->dev) in res_to_rt() triggered via addr_handler() during asynchronous address resolution: " WARNING: drivers/infiniband/core/restrack.c:138 at res_to_rt+0x1c4/0x230 CPU#1: kworker/u8:4/59 Modules linked in: CPU: 1 UID: 0 PID: 59 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Compute Engine, BIOS Google 07/24/2026 Workqueue: ib_addr process_one_req RIP: 0010:res_to_rt+0x1c4/0x230 drivers/infiniband/core/restrack.c:138 RSP: 0018:ffffc9000201f850 EFLAGS: 00010293 RAX: ffffffff88d00ce5 RBX: ffff88807f0fd4f8 RCX: ffff88801e6e0000 RDX: 0000000000000000 RSI: ffffffff8fd996f0 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffff88801e6e0000 R09: 000000000000000a R10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff1100fe1fa9f R14: 0000000000000000 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff888125012000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00001d559c3d2000 CR3: 0000000077c4c000 CR4: 00000000003526f0 Call Trace: rdma_restrack_add+0x5a/0x8a0 drivers/infiniband/core/restrack.c:236 addr_handler+0x41a/0x5a0 drivers/infiniband/core/cma.c:3534 process_one_req+0x2eb/0x540 drivers/infiniband/core/addr.c:624 process_one_work kernel/workqueue.c:3375 [inline] process_scheduled_works+0xc4e/0x1630 kernel/workqueue.c:3458 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3539 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 " In addr_handler(), cma_acquire_dev_by_src_ip() is called to populate id_priv->cma_dev and bind the associated ib_device to id_priv->id.device. If cma_acquire_dev_by_src_ip() returns an error (non-zero status), the ID remains unassociated with any RDMA device. Previously, rdma_restrack_add(&id_priv->res) was invoked unconditionally even when cma_acquire_dev_by_src_ip() failed, passing a resource with a NULL dev pointer and triggering the WARN_ON assertion in res_to_rt(). Fix this by only adding the resource to restrack when acquiring the device succeeds. Reported-by: syzbot+72eddfbadda3e3928e72@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=72eddfbadda3e3928e72 Tested-by: syzbot+72eddfbadda3e3928e72@syzkaller.appspotmail.com Fixes: cb5cd0ea4eb3 ("RDMA/core: Add CM to restrack after successful attachment to a device") Link: https://patch.msgid.link/r/20260810220123.191696-1-yanjun.zhu@linux.dev Signed-off-by: Zhu Yanjun Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/core/cma.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index f29b6f6619fb9..357d4c1bad518 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -3289,10 +3289,12 @@ static void addr_handler(int status, struct sockaddr *src_addr, memcpy(addr, src_addr, rdma_addr_size(src_addr)); if (!status && !id_priv->cma_dev) { status = cma_acquire_dev_by_src_ip(id_priv); - if (status) + if (status) { pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n", status); - rdma_restrack_add(&id_priv->res); + } else { + rdma_restrack_add(&id_priv->res); + } } else if (status) { pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status); } -- 2.53.0