From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Hui Peng <phui@google.com>
Date: Wed, 29 Nov 2023 18:23:53 +0000
Subject: [PATCH] Fix an OOB write bug in attp_build_read_by_type_value_cmd

This is a backport of I2a95bbcce9a16ac84dd714eb4561428711a9872e

Bug: 297524203
Test: m com.android.btservices
Ignore-AOSP-First: security
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9cdac321797cbe8214bc3f6294ca9a71a4be07a7)
Merged-In: I8c5daedb1605307df697ea5d875153dfcf3f5181
Change-Id: I8c5daedb1605307df697ea5d875153dfcf3f5181
---
 stack/gatt/att_protocol.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/stack/gatt/att_protocol.cc b/stack/gatt/att_protocol.cc
index 142216cc9..5bd814c88 100644
--- a/stack/gatt/att_protocol.cc
+++ b/stack/gatt/att_protocol.cc
@@ -157,8 +157,14 @@ BT_HDR* attp_build_read_by_type_value_cmd(uint16_t payload_size,
                                           tGATT_FIND_TYPE_VALUE* p_value_type) {
   uint8_t* p;
   uint16_t len = p_value_type->value_len;
-  BT_HDR* p_buf =
-      (BT_HDR*)osi_malloc(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET);
+  BT_HDR* p_buf = nullptr;
+
+  if (payload_size < 5) {
+    return nullptr;
+  }
+
+  p_buf =
+  (BT_HDR*)osi_malloc(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET);
 
   p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
   p_buf->offset = L2CAP_MIN_OFFSET;