mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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116 lines
4.4 KiB
Diff
116 lines
4.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Chienyuan <chienyuanhuang@google.com>
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Date: Tue, 12 Feb 2019 16:01:00 +0800
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Subject: [PATCH] Fix OOB in bnep_is_packet_allowed
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Bug: 112050983
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Test: PoC
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Change-Id: I5d331f46cdba86c8e61de206a2ede1d2b348d7e4
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(cherry picked from commit 230f252b8a1a1073ec1a4081545b2ff62393d16d)
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CRs-Fixed: 3155069
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---
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stack/bnep/bnep_api.cc | 13 +++++++++++--
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stack/bnep/bnep_int.h | 4 ++--
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stack/bnep/bnep_utils.cc | 12 +++++++++++-
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3 files changed, 24 insertions(+), 5 deletions(-)
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diff --git a/stack/bnep/bnep_api.cc b/stack/bnep/bnep_api.cc
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index e5d3c0948..60c8d1117 100644
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--- a/stack/bnep/bnep_api.cc
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+++ b/stack/bnep/bnep_api.cc
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@@ -355,7 +355,7 @@ tBNEP_RESULT BNEP_WriteBuf(uint16_t handle, const RawAddress& p_dest_addr,
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/* Check if the packet should be filtered out */
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p_data = (uint8_t*)(p_buf + 1) + p_buf->offset;
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if (bnep_is_packet_allowed(p_bcb, p_dest_addr, protocol, fw_ext_present,
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- p_data) != BNEP_SUCCESS) {
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+ p_data, p_buf->len) != BNEP_SUCCESS) {
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/*
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** If packet is filtered and ext headers are present
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** drop the data and forward the ext headers
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@@ -367,6 +367,11 @@ tBNEP_RESULT BNEP_WriteBuf(uint16_t handle, const RawAddress& p_dest_addr,
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org_len = p_buf->len;
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new_len = 0;
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do {
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+ if ((new_len + 2) > org_len) {
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+ osi_free(p_buf);
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+ return BNEP_IGNORE_CMD;
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+ }
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+
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ext = *p_data++;
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length = *p_data++;
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p_data += length;
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@@ -457,7 +462,7 @@ tBNEP_RESULT BNEP_Write(uint16_t handle, const RawAddress& p_dest_addr,
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/* Check if the packet should be filtered out */
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if (bnep_is_packet_allowed(p_bcb, p_dest_addr, protocol, fw_ext_present,
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- p_data) != BNEP_SUCCESS) {
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+ p_data, len) != BNEP_SUCCESS) {
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/*
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** If packet is filtered and ext headers are present
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** drop the data and forward the ext headers
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@@ -470,6 +475,10 @@ tBNEP_RESULT BNEP_Write(uint16_t handle, const RawAddress& p_dest_addr,
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new_len = 0;
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p = p_data;
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do {
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+ if ((new_len + 2) > org_len) {
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+ return BNEP_IGNORE_CMD;
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+ }
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+
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ext = *p_data++;
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length = *p_data++;
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p_data += length;
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diff --git a/stack/bnep/bnep_int.h b/stack/bnep/bnep_int.h
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index e25e7f822..1abb3340f 100644
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--- a/stack/bnep/bnep_int.h
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+++ b/stack/bnep/bnep_int.h
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@@ -229,8 +229,8 @@ extern void bnep_sec_check_complete(const RawAddress* bd_addr,
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extern tBNEP_RESULT bnep_is_packet_allowed(tBNEP_CONN* p_bcb,
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const RawAddress& p_dest_addr,
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uint16_t protocol,
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- bool fw_ext_present,
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- uint8_t* p_data);
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+ bool fw_ext_present, uint8_t* p_data,
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+ uint16_t org_len);
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extern uint32_t bnep_get_uuid32(tBT_UUID* src_uuid);
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#endif
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diff --git a/stack/bnep/bnep_utils.cc b/stack/bnep/bnep_utils.cc
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index 3bab9eebd..76065dfe5 100644
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--- a/stack/bnep/bnep_utils.cc
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+++ b/stack/bnep/bnep_utils.cc
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@@ -1253,23 +1253,33 @@ void bnep_sec_check_complete(UNUSED_ATTR const RawAddress* bd_addr,
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tBNEP_RESULT bnep_is_packet_allowed(tBNEP_CONN* p_bcb,
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const RawAddress& p_dest_addr,
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uint16_t protocol, bool fw_ext_present,
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- uint8_t* p_data) {
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+ uint8_t* p_data, uint16_t org_len) {
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if (p_bcb->rcvd_num_filters) {
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uint16_t i, proto;
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/* Findout the actual protocol to check for the filtering */
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proto = protocol;
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if (proto == BNEP_802_1_P_PROTOCOL) {
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+ uint16_t new_len = 0;
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if (fw_ext_present) {
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uint8_t len, ext;
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/* parse the extension headers and findout actual protocol */
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do {
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+ if ((new_len + 2) > org_len) {
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+ return BNEP_IGNORE_CMD;
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+ }
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+
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ext = *p_data++;
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len = *p_data++;
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p_data += len;
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+ new_len += (len + 2);
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+
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} while (ext & 0x80);
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}
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+ if ((new_len + 4) > org_len) {
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+ return BNEP_IGNORE_CMD;
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+ }
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p_data += 2;
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BE_STREAM_TO_UINT16(proto, p_data);
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}
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