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 2A2671F4717; Tue, 26 Aug 2025 13:00:00 +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=1756213200; cv=none; b=UKGapQQ+TJNKKmQkJ6WPXqc4fcP64XHUd2X/GpuO6egvqn4L1lRetdQ/z3+w3y3K/y5cTO4sPqeUw9F/VIpdYEcuvXvz1VIHUgIff+Vg9Bw6xq+MIjO6K7W3wJdHQg9yeDergzOYdGNBHtqHF/Y/xlNecINRJSJtt7bzHopuqHI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756213200; c=relaxed/simple; bh=e6iGZmcT4OknIkVNmZ8V6haLuVWXWUyTtH8NyO+HrQs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uKoHtdMJgkLa58jxIsUhOEx1lFFLlq0tWnSREUyMQDZHRNuiVq96m56u0E/gZGBnTMK2oeiZUW8Ne8nRToe6m87dTbTRsquUxatMuPsMhHf3vxfxAGu1ldly8iayPMIlwX7h6IcPL+hQVHSPZ5mXitIysZ7FQVouZEZSqA/8zLI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=q2Sn2b1o; 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="q2Sn2b1o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AF937C4CEF1; Tue, 26 Aug 2025 12:59:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756213200; bh=e6iGZmcT4OknIkVNmZ8V6haLuVWXWUyTtH8NyO+HrQs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q2Sn2b1otbWxC+JIwcVk0/p8j+AAU0RIsXB22bNtdPzEh8PnG7twrM9HSyzBo9tlC psC+xWWTmt7TpeLkv7afsYpdkF8ob/ntgq8LfQEL8gNIdClPjzaKIjrG8Nz3ZXLA4v UKT0Gx7vPVna8JF4p2KpC57e/bBmPYI0bXyO1B08= 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 6.6 227/587] scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated Date: Tue, 26 Aug 2025 13:06:16 +0200 Message-ID: <20250826110958.709064713@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110952.942403671@linuxfoundation.org> References: <20250826110952.942403671@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: 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 0fda8905eabd..916c07648460 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -3184,7 +3184,8 @@ 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