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 D306817A2EA; Mon, 22 Sep 2025 19:32:21 +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=1758569541; cv=none; b=r6A7vNzKQ/DyiVGe75bmdwWDw6njrGaiC276rwoWwttBtPI9dC/t9mj2XlOzRakSZcszeVnm/zKmtmS1OBnw10OBtQG0sNQmz+d13ig1t/mv2uRD9CbwgJ46zOESPZA8KLD7sG9G3cb0td9YRjcKkvpeQrv19Vf0Az7IbivzAyg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758569541; c=relaxed/simple; bh=HU/LkVE4xK7U6YYazTC/lhk+ASfRqyKfhcWbdecCmLo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S0/Tcbz2VZAmqdtelRJ0tW9UytR/aqVCdqiTiKxMI0K4bPWQ9/4K0e/tlKrTYgBiaxl4MjvNSF5IIMSGlWs1AGtcNJV/pSJZqdB1j5+tAHyx3j7ULRiVnPvKlOQ8YqxAlZW4NaSEJKY8hA4qNaDXPlIKwFP3R1gJvDo8a9Zqo/w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=J7EdgjeH; 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="J7EdgjeH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 288FEC4CEF0; Mon, 22 Sep 2025 19:32:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758569541; bh=HU/LkVE4xK7U6YYazTC/lhk+ASfRqyKfhcWbdecCmLo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J7EdgjeHmTSdUpHOemZlldwEImHZN/ZAZ6jelnQZV9ksOQK18HOL4b9d61NOU06Dg D6BhG6AnS/SyTdOfl4f6kPErdO44DKHSz7Yrki1ZKsO1kYIZDKPekXqDUOR3V37u3B +JsD99p7e60xiHKK1AMhPu+HB0M+fateJrWgADrk= 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 6.1 21/61] ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size Date: Mon, 22 Sep 2025 21:29:14 +0200 Message-ID: <20250922192404.133503441@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250922192403.524848428@linuxfoundation.org> References: <20250922192403.524848428@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 6.1-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 @@ -548,7 +548,7 @@ 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 < @@ -558,6 +558,7 @@ 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 || @@ -565,6 +566,14 @@ 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) {