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Commit b49c313c authored by Ted Wang's avatar Ted Wang
Browse files

Fix potential OOB write in btm_read_remote_ext_features_complete 

Add event length check to avoid hci event sent from controller not
correct.
Add page number check to avoid page number is bigger than max page
number.

Bug: 141552859
Test: inject function
Change-Id: I3bd7349f382aa0e42123bbd835dcb60b77af099a
parent fbc2d07b

system/stack/btm/btm_acl.cc

+16 −1
Original line number Diff line number Diff line
@@ -1084,7 +1084,7 @@ void btm_read_remote_features_complete(uint8_t* p) { 
 * Returns          void

 *

 ******************************************************************************/

void btm_read_remote_ext_features_complete(uint8_t* p) {

void btm_read_remote_ext_features_complete(uint8_t* p, uint8_t evt_len) {

  tACL_CONN* p_acl_cb;

  uint8_t page_num, max_page;

  uint16_t handle;
@@ -1092,6 +1092,14 @@ void btm_read_remote_ext_features_complete(uint8_t* p) { 


  BTM_TRACE_DEBUG("btm_read_remote_ext_features_complete");



  if (evt_len < HCI_EXT_FEATURES_SUCCESS_EVT_LEN) {

    android_errorWriteLog(0x534e4554, "141552859");

    BTM_TRACE_ERROR(

        "btm_read_remote_ext_features_complete evt length too short. length=%d",

        evt_len);

    return;

  }



  ++p;

  STREAM_TO_UINT16(handle, p);

  STREAM_TO_UINT8(page_num, p);
@@ -1111,6 +1119,13 @@ void btm_read_remote_ext_features_complete(uint8_t* p) { 
    return;

  }



  if (page_num > max_page) {

    android_errorWriteLog(0x534e4554, "141552859");

    BTM_TRACE_ERROR("btm_read_remote_ext_features_complete num_page=%d invalid",

                    page_num);

    return;

  }



  p_acl_cb = &btm_cb.acl_db[acl_idx];



  /* Copy the received features page */

system/stack/btm/btm_int.h

+1 −1
Original line number Diff line number Diff line
@@ -119,7 +119,7 @@ extern uint16_t btm_get_acl_disc_reason_code(void); 
extern tBTM_STATUS btm_remove_acl(const RawAddress& bd_addr,

                                  tBT_TRANSPORT transport);

extern void btm_read_remote_features_complete(uint8_t* p);

extern void btm_read_remote_ext_features_complete(uint8_t* p);

extern void btm_read_remote_ext_features_complete(uint8_t* p, uint8_t evt_len);

extern void btm_read_remote_ext_features_failed(uint8_t status,

                                                uint16_t handle);

extern void btm_read_remote_version_complete(uint8_t* p);

system/stack/btu/btu_hcif.cc

+6 −4
Original line number Diff line number Diff line
@@ -75,7 +75,8 @@ static void btu_hcif_authentication_comp_evt(uint8_t* p); 
static void btu_hcif_rmt_name_request_comp_evt(uint8_t* p, uint16_t evt_len);

static void btu_hcif_encryption_change_evt(uint8_t* p);

static void btu_hcif_read_rmt_features_comp_evt(uint8_t* p);

static void btu_hcif_read_rmt_ext_features_comp_evt(uint8_t* p);

static void btu_hcif_read_rmt_ext_features_comp_evt(uint8_t* p,

                                                    uint8_t evt_len);

static void btu_hcif_read_rmt_version_comp_evt(uint8_t* p);

static void btu_hcif_qos_setup_comp_evt(uint8_t* p);

static void btu_hcif_command_complete_evt(BT_HDR* response, void* context);
@@ -295,7 +296,7 @@ void btu_hcif_process_event(UNUSED_ATTR uint8_t controller_id, BT_HDR* p_msg) { 
      btu_hcif_read_rmt_features_comp_evt(p);

      break;

    case HCI_READ_RMT_EXT_FEATURES_COMP_EVT:

      btu_hcif_read_rmt_ext_features_comp_evt(p);

      btu_hcif_read_rmt_ext_features_comp_evt(p, hci_evt_len);

      break;

    case HCI_READ_RMT_VERSION_COMP_EVT:

      btu_hcif_read_rmt_version_comp_evt(p);
@@ -1211,7 +1212,8 @@ static void btu_hcif_read_rmt_features_comp_evt(uint8_t* p) { 
 * Returns          void

 *

 ******************************************************************************/

static void btu_hcif_read_rmt_ext_features_comp_evt(uint8_t* p) {

static void btu_hcif_read_rmt_ext_features_comp_evt(uint8_t* p,

                                                    uint8_t evt_len) {

  uint8_t* p_cur = p;

  uint8_t status;

  uint16_t handle;
@@ -1219,7 +1221,7 @@ static void btu_hcif_read_rmt_ext_features_comp_evt(uint8_t* p) { 
  STREAM_TO_UINT8(status, p_cur);



  if (status == HCI_SUCCESS)

    btm_read_remote_ext_features_complete(p);

    btm_read_remote_ext_features_complete(p, evt_len);

  else {

    STREAM_TO_UINT16(handle, p_cur);

    btm_read_remote_ext_features_failed(status, handle);

system/stack/include/hcidefs.h

+2 −0
Original line number Diff line number Diff line
@@ -1323,6 +1323,8 @@ typedef struct { 


#define HCI_FEATURE_BYTES_PER_PAGE 8



#define HCI_EXT_FEATURES_SUCCESS_EVT_LEN 13



#define HCI_FEATURES_KNOWN(x) \

  (((x)[0] | (x)[1] | (x)[2] | (x)[3] | (x)[4] | (x)[5] | (x)[6] | (x)[7]) != 0)