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.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/stack/gatt/att_protocol.c b/stack/gatt/att_protocol.c
index e09636220..1e9948185 100644
--- a/stack/gatt/att_protocol.c
+++ b/stack/gatt/att_protocol.c
@@ -156,7 +156,14 @@ BT_HDR *attp_build_read_by_type_value_cmd (UINT16 payload_size, tGATT_FIND_TYPE_
 {
     UINT8 *p;
     UINT16 len = p_value_type->value_len;
-    BT_HDR *p_buf =
+    BT_HDR *p_buf = NULL;
+
+    if (payload_size < 5)
+    {
+        return NULL;
+    }
+
+    p_buf =
         (BT_HDR *)osi_malloc(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET);
 
     p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;