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66 lines
2.7 KiB
Diff
66 lines
2.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Delwiche <delwiche@google.com>
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Date: Fri, 2 Dec 2022 00:41:24 +0000
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Subject: [PATCH] Report failure when not able to connect to AVRCP
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A crash may occur when creating a bluetooth AVRCP connection to a
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device.
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The code fails to check a return value from an AVRCP function
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being used to index into an array. The return value may exceed the
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size of the array causing memory outside the bounds of the array to be
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accessed leading to memory corruption and a crash.
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The fix is to ensure the return value is within the bounds of the
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array before accessing the array contents. If the return value is
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not within the bounds of the array report it as a failure to the
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bluetooth stack.
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This change is relevant for android automotive because the IVI
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(in-vehicle infotainment system) acts as the an AVRCP controller
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which still executes this code.
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Note: this is a backport of b/214569798, inducted as a non-security
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issue. Per b/226927612 it has been found to have security impact
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and should be backported to earlier branches.
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Bug: 226927612
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Test: Manual - set return value to be out of bounds, verify no crash
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Tag: #security
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Ignore-AOSP-First: Security
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Change-Id: I03f89f894c759b85e555a024435b625397ef7e5c
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Merged-In: I03f89f894c759b85e555a024435b625397ef7e5c
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(cherry picked from commit 86112bf0535f3f5a4c6a0a137e67b0eebd9bbdf5)
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Merged-In: I03f89f894c759b85e555a024435b625397ef7e5c
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---
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bta/av/bta_av_act.cc | 16 +++++++++++++++-
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1 file changed, 15 insertions(+), 1 deletion(-)
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diff --git a/bta/av/bta_av_act.cc b/bta/av/bta_av_act.cc
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index 541d68303..2043b75cf 100644
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--- a/bta/av/bta_av_act.cc
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+++ b/bta/av/bta_av_act.cc
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@@ -1826,7 +1826,21 @@ void bta_av_rc_disc_done(UNUSED_ATTR tBTA_AV_DATA* p_data) {
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if (p_lcb) {
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rc_handle = bta_av_rc_create(p_cb, AVCT_INT,
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(uint8_t)(p_scb->hdi + 1), p_lcb->lidx);
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- p_cb->rcb[rc_handle].peer_features = peer_features;
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+ if (rc_handle < BTA_AV_NUM_RCB) {
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+ p_cb->rcb[rc_handle].peer_features = peer_features;
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+ } else {
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+ /* cannot create valid rc_handle for current device. report failure
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+ */
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+ APPL_TRACE_ERROR("%s: no link resources available", __func__);
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+ p_scb->use_rc = false;
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+ tBTA_AV_RC_OPEN rc_open;
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+ rc_open.peer_addr = p_scb->PeerAddress();
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+ rc_open.peer_features = 0;
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+ rc_open.status = BTA_AV_FAIL_RESOURCES;
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+ tBTA_AV bta_av_data;
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+ bta_av_data.rc_open = rc_open;
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+ (*p_cb->p_cback)(BTA_AV_RC_OPEN_EVT, &bta_av_data);
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+ }
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} else {
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APPL_TRACE_ERROR("can not find LCB!!");
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}
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