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39 lines
1.4 KiB
Diff
39 lines
1.4 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, 29 Nov 2023 18:23:53 +0000
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Subject: [PATCH] Fix an OOB write bug in attp_build_read_by_type_value_cmd
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This is a backport of I2a95bbcce9a16ac84dd714eb4561428711a9872e
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Bug: 297524203
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Test: m com.android.btservices
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Ignore-AOSP-First: security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9cdac321797cbe8214bc3f6294ca9a71a4be07a7)
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Merged-In: I8c5daedb1605307df697ea5d875153dfcf3f5181
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Change-Id: I8c5daedb1605307df697ea5d875153dfcf3f5181
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---
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stack/gatt/att_protocol.cc | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/stack/gatt/att_protocol.cc b/stack/gatt/att_protocol.cc
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index 5d3d4a818..cdf472e40 100644
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--- a/stack/gatt/att_protocol.cc
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+++ b/stack/gatt/att_protocol.cc
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@@ -157,8 +157,14 @@ BT_HDR* attp_build_read_by_type_value_cmd(uint16_t payload_size,
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tGATT_FIND_TYPE_VALUE* p_value_type) {
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uint8_t* p;
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uint16_t len = p_value_type->value_len;
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- BT_HDR* p_buf =
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- (BT_HDR*)osi_malloc(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET);
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+ BT_HDR* p_buf = nullptr;
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+
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+ if (payload_size < 5) {
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+ return nullptr;
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+ }
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+
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+ p_buf =
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+ (BT_HDR*)osi_malloc(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET);
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p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
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p_buf->offset = L2CAP_MIN_OFFSET;
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