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 B27DA34E1A8; Mon, 18 Aug 2025 14:03:23 +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=1755525803; cv=none; b=iYBm36wwOGaaDjJ05hj+C/VphGnl6LQ/pLHHQFt3XNIKeyly0c71lXGi0sYlhE3VVqQmSvdqKL2c2hvDdabHS6cZpNSA6YGSzWDwKpjCbbfLl+KsZzIXI2uT9vJXVwowvJFZBuskbd++hPAOxHyv8FjvGbQ5gxnZGcH1qWiEAHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755525803; c=relaxed/simple; bh=fssLHxEadwbQiFWqMYnvZxqADe9xt2mw79ks+S9JzQ4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SUB7bshiZ6cRXPdqWWCbnSHNktee9zko5NhDyrCsg7EYH1uSBW6x70lgsuLQ1V3fjbnRN8A3c0LEc+/mERI72zS5qKGJKNOixGbC0MewRGZzxj9Gpe4kEz4JXKcy5pEdROKAreTdjhDZn8WdTNJ8VcFyXOxWy6lX6nSI3gU0uZ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=obbg2dLD; 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="obbg2dLD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 223C3C4CEEB; Mon, 18 Aug 2025 14:03:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755525803; bh=fssLHxEadwbQiFWqMYnvZxqADe9xt2mw79ks+S9JzQ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=obbg2dLDQXnMYKPYlr85p6mleavmo2kEhm0URuRnC4u8GRWa4YM3kaPwLMjE4AFRD nhVzb31wtgifuGTHnsvamwxIDgHZk2RsUbpu5xBv6Yyr8urHWJKKkgAjTIA7NxrDbX kxE8SkBdH0L5bgQHnaqvHjqEeSzZvx8YhNOEwJig= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Showrya M N , Potnuri Bharat Teja , Chris Leech , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.16 370/570] scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated Date: Mon, 18 Aug 2025 14:45:57 +0200 Message-ID: <20250818124520.108356159@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250818124505.781598737@linuxfoundation.org> References: <20250818124505.781598737@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 6.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Showrya M N [ Upstream commit 3ea3a256ed81f95ab0f3281a0e234b01a9cae605 ] In case of an ib_fast_reg_mr allocation failure during iSER setup, the machine hits a panic because iscsi_conn->dd_data is initialized unconditionally, even when no memory is allocated (dd_size == 0). This leads invalid pointer dereference during connection teardown. Fix by setting iscsi_conn->dd_data only if memory is actually allocated. Panic trace: ------------ iser: iser_create_fastreg_desc: Failed to allocate ib_fast_reg_mr err=-12 iser: iser_alloc_rx_descriptors: failed allocating rx descriptors / data buffers BUG: unable to handle page fault for address: fffffffffffffff8 RIP: 0010:swake_up_locked.part.5+0xa/0x40 Call Trace: complete+0x31/0x40 iscsi_iser_conn_stop+0x88/0xb0 [ib_iser] iscsi_stop_conn+0x66/0xc0 [scsi_transport_iscsi] iscsi_if_stop_conn+0x14a/0x150 [scsi_transport_iscsi] iscsi_if_rx+0x1135/0x1834 [scsi_transport_iscsi] ? netlink_lookup+0x12f/0x1b0 ? netlink_deliver_tap+0x2c/0x200 netlink_unicast+0x1ab/0x280 netlink_sendmsg+0x257/0x4f0 ? _copy_from_user+0x29/0x60 sock_sendmsg+0x5f/0x70 Signed-off-by: Showrya M N Signed-off-by: Potnuri Bharat Teja Link: https://lore.kernel.org/r/20250627112329.19763-1-showrya@chelsio.com Reviewed-by: Chris Leech Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/libiscsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 392d57e054db..c9f410c50978 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -3185,7 +3185,8 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, return NULL; conn = cls_conn->dd_data; - conn->dd_data = cls_conn->dd_data + sizeof(*conn); + if (dd_size) + conn->dd_data = cls_conn->dd_data + sizeof(*conn); conn->session = session; conn->cls_conn = cls_conn; conn->c_stage = ISCSI_CONN_INITIAL_STAGE; -- 2.39.5