DivestOS/Patches/LineageOS-17.1/android_system_bt/352276.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Hui Peng <phui@google.com>
Date: Wed, 28 Dec 2022 00:32:37 +0000
Subject: [PATCH] Fix an OOB Write bug in gatt_check_write_long_terminate
this is the backport of Ifffa2c7f679c4ef72dbdb6b1f3378ca506680084
Bug: 258652631
Test: manual
Tag: #security
Ignore-AOSP-First: security
Change-Id: Ic84122f07cbc198c676d366e39606621b7cb4e66
(cherry picked from commit 9b17660bfd6f0f41cb9400ce0236d76c83605e03)
Merged-In: Ic84122f07cbc198c676d366e39606621b7cb4e66
---
stack/gatt/gatt_cl.cc | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/stack/gatt/gatt_cl.cc b/stack/gatt/gatt_cl.cc
index 3115317da..db41c5f9f 100644
--- a/stack/gatt/gatt_cl.cc
+++ b/stack/gatt/gatt_cl.cc
@@ -572,7 +572,8 @@ void gatt_process_prep_write_rsp(tGATT_TCB& tcb, tGATT_CLCB* p_clcb,
LOG(ERROR) << StringPrintf("value resp op_code = %s len = %d",
gatt_dbg_op_name(op_code), len);
- if (len < GATT_PREP_WRITE_RSP_MIN_LEN) {
+ if (len < GATT_PREP_WRITE_RSP_MIN_LEN ||
+ len > GATT_PREP_WRITE_RSP_MIN_LEN + sizeof(value.value)) {
LOG(ERROR) << "illegal prepare write response length, discard";
gatt_end_operation(p_clcb, GATT_INVALID_PDU, &value);
return;
@@ -581,7 +582,7 @@ void gatt_process_prep_write_rsp(tGATT_TCB& tcb, tGATT_CLCB* p_clcb,
STREAM_TO_UINT16(value.handle, p);
STREAM_TO_UINT16(value.offset, p);
- value.len = len - 4;
+ value.len = len - GATT_PREP_WRITE_RSP_MIN_LEN;
memcpy(value.value, p, value.len);