From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 598B6284B33; Sun, 7 Sep 2025 20:22:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757276541; cv=none; b=o1+M1Il+Tq5HcXL0X8e2yFOc50Q0S/DMPGqYXCuUHFJY0mLhhsWXnnAiyEOAXUBN7FbRpzKylcavzdIV9Lfpn5fSo05oO6PA2/bZLpacdn8z/K11F9BYOFiLIKbtLwq5j4koWlHkUcwAlKVBeOxS8cUIWnWYm/3iO6kH6ftm7T0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757276541; c=relaxed/simple; bh=N2OgkWruRbBU+VqLbKlLQ78R6xfpoanBBzt9LSKgQwI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e6g0j0gfsEsi/eJnXb7/EtB11vCFSukpRAbxEJaecGfmM7AWKsMjpcojOoA3R7Mb4ee76H9BDRUFILPtUTRC7Cimnzm3MQRy4LcTuEFeaS7rE2OgndRihMMlOhK5WPR3InBEmy/SLVDCKzjM9PFPvrF+Fz5onC7lQ0TpOa1/hlI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YTC6prlP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="YTC6prlP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D62D0C4CEF0; Sun, 7 Sep 2025 20:22:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1757276541; bh=N2OgkWruRbBU+VqLbKlLQ78R6xfpoanBBzt9LSKgQwI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YTC6prlPjSxLn6gdcQkTrZYd4p1uH8xYJBPrAAWAgi6JIfZEO/4ZCgKoCBqRAQ7Rh astFE+vsC1J/ci/VfJhl2xM/bYyugwOIUWk4Dm6b5HAxtb6SdVD2UAPJQZc2/G54HQ 4nnmbovMzt3uLGpZGK71XhpGaGh4xSa5c46VJxss= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Liu Jian , Guangguan Wang , Zhu Yanjun , "D. Wythe" , Paolo Abeni , Sasha Levin Subject: [PATCH 6.6 031/121] net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() Date: Sun, 7 Sep 2025 21:57:47 +0200 Message-ID: <20250907195610.629045731@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250907195609.817339617@linuxfoundation.org> References: <20250907195609.817339617@linuxfoundation.org> User-Agent: quilt/0.68 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: Liu Jian [ Upstream commit ba1e9421cf1a8369d25c3832439702a015d6b5f9 ] BUG: kernel NULL pointer dereference, address: 00000000000002ec PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI CPU: 28 UID: 0 PID: 343 Comm: kworker/28:1 Kdump: loaded Tainted: G OE 6.17.0-rc2+ #9 NONE Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 Workqueue: smc_hs_wq smc_listen_work [smc] RIP: 0010:smc_ib_is_sg_need_sync+0x9e/0xd0 [smc] ... Call Trace: smcr_buf_map_link+0x211/0x2a0 [smc] __smc_buf_create+0x522/0x970 [smc] smc_buf_create+0x3a/0x110 [smc] smc_find_rdma_v2_device_serv+0x18f/0x240 [smc] ? smc_vlan_by_tcpsk+0x7e/0xe0 [smc] smc_listen_find_device+0x1dd/0x2b0 [smc] smc_listen_work+0x30f/0x580 [smc] process_one_work+0x18c/0x340 worker_thread+0x242/0x360 kthread+0xe7/0x220 ret_from_fork+0x13a/0x160 ret_from_fork_asm+0x1a/0x30 If the software RoCE device is used, ibdev->dma_device is a null pointer. As a result, the problem occurs. Null pointer detection is added to prevent problems. Fixes: 0ef69e788411c ("net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu") Signed-off-by: Liu Jian Reviewed-by: Guangguan Wang Reviewed-by: Zhu Yanjun Reviewed-by: D. Wythe Link: https://patch.msgid.link/20250828124117.2622624-1-liujian56@huawei.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/smc/smc_ib.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index 598ac9ead64b7..6df543e083fb3 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -743,6 +743,9 @@ bool smc_ib_is_sg_need_sync(struct smc_link *lnk, unsigned int i; bool ret = false; + if (!lnk->smcibdev->ibdev->dma_device) + return ret; + /* for now there is just one DMA address */ for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, buf_slot->sgt[lnk->link_idx].nents, i) { -- 2.50.1