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42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hui Peng <phui@google.com>
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Date: Wed, 28 Dec 2022 00:32:37 +0000
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Subject: [PATCH] Fix an OOB Write bug in gatt_check_write_long_terminate
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this is the backport of Ifffa2c7f679c4ef72dbdb6b1f3378ca506680084
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Bug: 258652631
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Test: manual
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Tag: #security
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Ignore-AOSP-First: security
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Change-Id: Ic84122f07cbc198c676d366e39606621b7cb4e66
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(cherry picked from commit 9b17660bfd6f0f41cb9400ce0236d76c83605e03)
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Merged-In: Ic84122f07cbc198c676d366e39606621b7cb4e66
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---
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stack/gatt/gatt_cl.cc | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/stack/gatt/gatt_cl.cc b/stack/gatt/gatt_cl.cc
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index 46572dd06..f8d5bab92 100644
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--- a/stack/gatt/gatt_cl.cc
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+++ b/stack/gatt/gatt_cl.cc
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@@ -573,7 +573,8 @@ void gatt_process_prep_write_rsp(tGATT_TCB& tcb, tGATT_CLCB* p_clcb,
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LOG(ERROR) << StringPrintf("value resp op_code = %s len = %d",
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gatt_dbg_op_name(op_code), len);
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- if (len < GATT_PREP_WRITE_RSP_MIN_LEN) {
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+ if (len < GATT_PREP_WRITE_RSP_MIN_LEN ||
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+ len > GATT_PREP_WRITE_RSP_MIN_LEN + sizeof(value.value)) {
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LOG(ERROR) << "illegal prepare write response length, discard";
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gatt_end_operation(p_clcb, GATT_INVALID_PDU, &value);
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return;
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@@ -582,7 +583,7 @@ void gatt_process_prep_write_rsp(tGATT_TCB& tcb, tGATT_CLCB* p_clcb,
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STREAM_TO_UINT16(value.handle, p);
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STREAM_TO_UINT16(value.offset, p);
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- value.len = len - 4;
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+ value.len = len - GATT_PREP_WRITE_RSP_MIN_LEN;
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memcpy(value.value, p, value.len);
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