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46 lines
1.9 KiB
Diff
46 lines
1.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: tyiu <tyiu@google.com>
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Date: Tue, 28 Mar 2023 18:40:51 +0000
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Subject: [PATCH] Fix gatt_end_operation buffer overflow
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Added boundary check for gatt_end_operation to prevent writing out of
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boundary.
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Since response of the GATT server is handled in
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gatt_client_handle_server_rsp() and gatt_process_read_rsp(), the maximum
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lenth that can be passed into the handlers is bounded by
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GATT_MAX_MTU_SIZE, which is set to 517, which is greater than
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GATT_MAX_ATTR_LEN which is set to 512. The fact that there is no spec
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that gaurentees MTU response to be less than or equal to 512 bytes can
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cause a buffer overflow when performing memcpy without length check.
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Bug: 261068592
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Test: No test since not affecting behavior
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Tag: #security
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Ignore-AOSP-First: security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:dd7298e982e4bbf0138a490562679c9a4a755200)
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Merged-In: I49e2797cd9300ee4cd69f2c7fa5f0073db78b873
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Change-Id: I49e2797cd9300ee4cd69f2c7fa5f0073db78b873
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---
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stack/gatt/gatt_utils.cc | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/stack/gatt/gatt_utils.cc b/stack/gatt/gatt_utils.cc
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index 9e8d3b930..52891efc4 100644
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--- a/stack/gatt/gatt_utils.cc
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+++ b/stack/gatt/gatt_utils.cc
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@@ -1193,6 +1193,13 @@ void gatt_end_operation(tGATT_CLCB* p_clcb, tGATT_STATUS status, void* p_data) {
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cb_data.att_value.handle = p_clcb->s_handle;
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cb_data.att_value.len = p_clcb->counter;
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+ if (cb_data.att_value.len > GATT_MAX_ATTR_LEN) {
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+ LOG(WARNING) << __func__
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+ << StringPrintf(" Large cb_data.att_value, size=%d",
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+ cb_data.att_value.len);
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+ cb_data.att_value.len = GATT_MAX_ATTR_LEN;
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+ }
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+
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if (p_data && p_clcb->counter)
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memcpy(cb_data.att_value.value, p_data, cb_data.att_value.len);
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}
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