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 85EBF1FDA89; Mon, 22 Sep 2025 19:34:41 +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=1758569681; cv=none; b=ZIWb2IY63wDebG2EOqNLJQGOeiUl/rVVEGFelZ79FREgdWeuR3wWWtTC1fT+8l2jTnmx0aKG0muzCf+hDcATS4Zk6t4I7Bal2uelojURdp0J4X6fzH/ySQ23St5qtFZ92A/JDuhPiRbkyktsBBuXF8G73kJq6LLxP/SYbrtICgg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758569681; c=relaxed/simple; bh=dcjT9okpzy3BmcRq28rgo4MjdnV7GQkdXUYS/0z49dA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VZYqAgZwiz22T0bECSU104V3JSgUixZhFFFiq9u6Qq+YTMXzigt56lJdap6sJz+LwS52KTM8c0BB3Ycdg1U8eCbk6o9cbSHCbIm3k87wjhPbWOIK4QljvNV2QO1ngj03V95N3BZB0xqaFtcFa/TOdLWG9ENbT+mav3gI65V8jb8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=c4j67MVm; 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="c4j67MVm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B87F5C4CEF0; Mon, 22 Sep 2025 19:34:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758569681; bh=dcjT9okpzy3BmcRq28rgo4MjdnV7GQkdXUYS/0z49dA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c4j67MVm4OKT/dsl/Fk/VN0sP8VZPzDhq8tY3a1Cd0S0fizfJ1KN/TI3j3ASahDOT sTA9ye1Xylgu4fTdjcq3ZvTbHRgGuRKgsX21r1lYlVm+CTCd1aMZolk61S//uYc1kr 3HrXAGbErr2yxPvZF8XYwWh4S+OfHh/0rUeeQgao= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Steve French , Tom Talpey , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, Namjae Jeon , Stefan Metzmacher , Steve French Subject: [PATCH 6.6 27/70] ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size Date: Mon, 22 Sep 2025 21:29:27 +0200 Message-ID: <20250922192405.307453170@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250922192404.455120315@linuxfoundation.org> References: <20250922192404.455120315@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org 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: Stefan Metzmacher commit e1868ba37fd27c6a68e31565402b154beaa65df0 upstream. This is inspired by the check for data_offset + data_length. Cc: Steve French Cc: Tom Talpey Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Cc: stable@vger.kernel.org Fixes: 2ea086e35c3d ("ksmbd: add buffer validation for smb direct") Acked-by: Namjae Jeon Signed-off-by: Stefan Metzmacher Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/transport_rdma.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- a/fs/smb/server/transport_rdma.c +++ b/fs/smb/server/transport_rdma.c @@ -553,7 +553,7 @@ static void recv_done(struct ib_cq *cq, case SMB_DIRECT_MSG_DATA_TRANSFER: { struct smb_direct_data_transfer *data_transfer = (struct smb_direct_data_transfer *)recvmsg->packet; - unsigned int data_offset, data_length; + u32 remaining_data_length, data_offset, data_length; int avail_recvmsg_count, receive_credits; if (wc->byte_len < @@ -563,6 +563,7 @@ static void recv_done(struct ib_cq *cq, return; } + remaining_data_length = le32_to_cpu(data_transfer->remaining_data_length); data_length = le32_to_cpu(data_transfer->data_length); data_offset = le32_to_cpu(data_transfer->data_offset); if (wc->byte_len < data_offset || @@ -570,6 +571,14 @@ static void recv_done(struct ib_cq *cq, put_recvmsg(t, recvmsg); smb_direct_disconnect_rdma_connection(t); return; + } + if (remaining_data_length > t->max_fragmented_recv_size || + data_length > t->max_fragmented_recv_size || + (u64)remaining_data_length + (u64)data_length > + (u64)t->max_fragmented_recv_size) { + put_recvmsg(t, recvmsg); + smb_direct_disconnect_rdma_connection(t); + return; } if (data_length) {