[automerger] DO NOT MERGE: Fix possible OOB when AVDT data channel recive ACL data am: 10e0027a56 (bdceca1d) · Commits · e / os / android_packages_modules_Bluetooth

system/stack/avdt/avdt_scb_act.c

+57 −3

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@
		*
		******************************************************************************/

		#include <cutils/log.h>
		#include <string.h>
		#include "bt_types.h"
		#include "bt_target.h"
		@@ -256,10 +257,15 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB p_scb, tAVDT_SCB_EVT p_data)
		UINT16 offset;
		UINT16 ex_len;
		UINT8 pad_len = 0;
		UINT16 len;

		len = p_data->p_pkt->len;
		p = p_start = (UINT8 *)(p_data->p_pkt + 1) + p_data->p_pkt->offset;

		/* parse media packet header */
		offset = 12;
		// AVDT_MSG_PRS_OCTET1(1) + AVDT_MSG_PRS_M_PT(1) + UINT16(2) + UINT32(4) + 4
		if (offset > len) goto length_error;
		AVDT_MSG_PRS_OCTET1(p, o_v, o_p, o_x, o_cc);
		AVDT_MSG_PRS_M_PT(p, m_pt, marker);
		BE_STREAM_TO_UINT16(seq, p);
		@@ -269,19 +275,20 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB p_scb, tAVDT_SCB_EVT p_data)
		UNUSED(o_v);

		/* skip over any csrc's in packet */
		offset += o_cc * 4;
		p += o_cc * 4;

		/* check for and skip over extension header */
		if (o_x)
		{
		offset += 4;
		if (offset > len) goto length_error;
		p += 2;
		BE_STREAM_TO_UINT16(ex_len, p);
		offset += ex_len * 4;
		p += ex_len * 4;
		}

		/* save our new offset */
		offset = (UINT16) (p - p_start);

		/* adjust length for any padding at end of packet */
		if (o_p)
		{
		@@ -325,6 +332,12 @@ void avdt_scb_hdl_pkt_no_frag(tAVDT_SCB p_scb, tAVDT_SCB_EVT p_data)
		osi_free_and_reset((void **)&p_data->p_pkt);
		}
		}
		return;
		length_error:
		android_errorWriteLog(0x534e4554, "111450156");
		AVDT_TRACE_WARNING("%s: hdl packet length %d too short: must be at least %d",
		__func__, len, offset);
		osi_free_and_reset((void**)&p_data->p_pkt);
		}

		#if AVDT_REPORTING == TRUE
		@@ -343,6 +356,7 @@ UINT8 * avdt_scb_hdl_report(tAVDT_SCB p_scb, UINT8 p, UINT16 len)
		UINT8 *p_start = p;
		UINT32 ssrc;
		UINT8 o_v, o_p, o_cc;
		UINT16 min_len = 0;
		AVDT_REPORT_TYPE pt;
		tAVDT_REPORT_DATA report, *p_rpt;

		@@ -351,6 +365,14 @@ UINT8 * avdt_scb_hdl_report(tAVDT_SCB p_scb, UINT8 p, UINT16 len)
		{
		p_rpt = &report;
		/* parse report packet header */
		min_len += 8;
		if (min_len > len) {
		android_errorWriteLog(0x534e4554, "111450156");
		AVDT_TRACE_WARNING(
		"%s: hdl packet length %d too short: must be at least %d", __func__,
		len, min_len);
		goto avdt_scb_hdl_report_exit;
		}
		AVDT_MSG_PRS_RPT_OCTET1(p, o_v, o_p, o_cc);
		pt = *p++;
		p += 2;
		@@ -362,6 +384,14 @@ UINT8 * avdt_scb_hdl_report(tAVDT_SCB p_scb, UINT8 p, UINT16 len)
		switch(pt)
		{
		case AVDT_RTCP_PT_SR: /* the packet type - SR (Sender Report) */
		min_len += 20;
		if (min_len > len) {
		android_errorWriteLog(0x534e4554, "111450156");
		AVDT_TRACE_WARNING(
		"%s: hdl packet length %d too short: must be at least %d",
		__func__, len, min_len);
		goto avdt_scb_hdl_report_exit;
		}
		BE_STREAM_TO_UINT32(report.sr.ntp_sec, p);
		BE_STREAM_TO_UINT32(report.sr.ntp_frac, p);
		BE_STREAM_TO_UINT32(report.sr.rtp_time, p);
		@@ -370,6 +400,14 @@ UINT8 * avdt_scb_hdl_report(tAVDT_SCB p_scb, UINT8 p, UINT16 len)
		break;

		case AVDT_RTCP_PT_RR: /* the packet type - RR (Receiver Report) */
		min_len += 20;
		if (min_len > len) {
		android_errorWriteLog(0x534e4554, "111450156");
		AVDT_TRACE_WARNING(
		"%s: hdl packet length %d too short: must be at least %d",
		__func__, len, min_len);
		goto avdt_scb_hdl_report_exit;
		}
		report.rr.frag_lost = *p;
		BE_STREAM_TO_UINT32(report.rr.packet_lost, p);
		report.rr.packet_lost &= 0xFFFFFF;
		@@ -382,10 +420,25 @@ UINT8 * avdt_scb_hdl_report(tAVDT_SCB p_scb, UINT8 p, UINT16 len)
		case AVDT_RTCP_PT_SDES: /* the packet type - SDES (Source Description) */
		if(*p == AVDT_RTCP_SDES_CNAME)
		{
		min_len += sizeof(tAVDT_REPORT_DATA) + 2;
		if (min_len > len) {
		android_errorWriteLog(0x534e4554, "111450156");
		AVDT_TRACE_WARNING(
		"%s: hdl packet length %d too short: must be at least %d",
		__func__, len, min_len);
		goto avdt_scb_hdl_report_exit;
		}
		p_rpt = (tAVDT_REPORT_DATA *)(p+2);
		}
		else
		{
		if (min_len + 1 > len) {
		android_errorWriteLog(0x534e4554, "111450156");
		AVDT_TRACE_WARNING(
		"%s: hdl packet length %d too short: must be at least %d",
		__func__, len, min_len + 2);
		goto avdt_scb_hdl_report_exit;
		}
		AVDT_TRACE_WARNING( " - SDES SSRC=0x%08x sc=%d %d len=%d %s",
		ssrc, o_cc, p, (p+1), p+2);
		result = AVDT_BUSY;
		@@ -401,6 +454,7 @@ UINT8 * avdt_scb_hdl_report(tAVDT_SCB p_scb, UINT8 p, UINT16 len)
		(*p_scb->cs.p_report_cback)(avdt_scb_to_hdl(p_scb), pt, p_rpt);

		}
		avdt_scb_hdl_report_exit:
		p_start += len;
		return p_start;
		}