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Fixed substream read in rdp_recv_tpkt_pdu

This commit is contained in:
akallabeth 2020-04-06 11:58:48 +02:00
parent 0533c05be3
commit 0ad894adbc
1 changed files with 16 additions and 23 deletions
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39
libfreerdp/core/rdp.c
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@ -102,7 +102,7 @@ const char* DATA_PDU_TYPE_STRINGS[80] = {
"?" /* 0x41 - 0x46 */
};
static BOOL rdp_read_flow_control_pdu(wStream* s, UINT16* type);
static BOOL rdp_read_flow_control_pdu(wStream* s, UINT16* type, UINT16* channel_id);
static void rdp_write_share_control_header(wStream* s, UINT16 length, UINT16 type,
UINT16 channel_id);
static void rdp_write_share_data_header(wStream* s, UINT16 length, BYTE type, UINT32 share_id);
@ -158,7 +158,7 @@ BOOL rdp_read_share_control_header(wStream* s, UINT16* length, UINT16* type, UIN
http://msdn.microsoft.com/en-us/library/cc240576.aspx */
if (len == 0x8000)
{
if (!rdp_read_flow_control_pdu(s, type))
if (!rdp_read_flow_control_pdu(s, type, channel_id))
return FALSE;
*channel_id = 0;
*length = 8; /* Flow control PDU is 8 bytes */
@ -1120,7 +1120,7 @@ int rdp_recv_out_of_sequence_pdu(rdpRdp* rdp, wStream* s)
}
}
BOOL rdp_read_flow_control_pdu(wStream* s, UINT16* type)
BOOL rdp_read_flow_control_pdu(wStream* s, UINT16* type, UINT16* channel_id)
{
/*
* Read flow control PDU - documented in FlowPDU section in T.128
@ -1136,10 +1136,10 @@ BOOL rdp_read_flow_control_pdu(wStream* s, UINT16* type)
return FALSE;
Stream_Read_UINT8(s, pduType); /* pduTypeFlow */
*type = pduType;
Stream_Seek_UINT8(s); /* pad8bits */
Stream_Seek_UINT8(s); /* flowIdentifier */
Stream_Seek_UINT8(s); /* flowNumber */
Stream_Seek_UINT16(s); /* pduSource */
Stream_Seek_UINT8(s); /* pad8bits */
Stream_Seek_UINT8(s); /* flowIdentifier */
Stream_Seek_UINT8(s); /* flowNumber */
Stream_Read_UINT16(s, *channel_id); /* pduSource */
return TRUE;
}
@ -1329,25 +1329,19 @@ static int rdp_recv_tpkt_pdu(rdpRdp* rdp, wStream* s)
while (Stream_GetRemainingLength(s) > 3)
{
wStream sub;
size_t startheader, endheader, start, end, diff, headerdiff;
size_t diff;
startheader = Stream_GetPosition(s);
if (!rdp_read_share_control_header(s, &pduLength, &pduType, &pduSource))
{
WLog_ERR(TAG, "rdp_recv_tpkt_pdu: rdp_read_share_control_header() fail");
return -1;
}
start = endheader = Stream_GetPosition(s);
headerdiff = endheader - startheader;
if (pduLength < headerdiff)
{
WLog_ERR(
TAG,
"rdp_recv_tpkt_pdu: rdp_read_share_control_header() invalid pduLength %" PRIu16,
pduLength);
return -1;
}
pduLength -= headerdiff;
/* Remove header data. */
if (pduLength > 5)
pduLength -= 6;
else
pduLength -= 4;
Stream_StaticInit(&sub, Stream_Pointer(s), pduLength);
if (!Stream_SafeSeek(s, pduLength))
return -1;
@ -1389,9 +1383,8 @@ static int rdp_recv_tpkt_pdu(rdpRdp* rdp, wStream* s)
break;
}
end = Stream_GetPosition(&sub);
diff = end - start;
if (diff != pduLength)
diff = Stream_GetRemainingLength(&sub);
if (diff > 0)
{
WLog_WARN(TAG,
"pduType %s not properly parsed, %" PRIdz