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https://github.com/Divested-Mobile/DivestOS-Build.git
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65 lines
2.6 KiB
Diff
65 lines
2.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Delwiche <delwiche@google.com>
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Date: Fri, 19 May 2023 19:17:16 +0000
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Subject: [PATCH] Fix integer overflow in build_read_multi_rsp
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Local variables tracking structure size in build_read_multi_rsp are of
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uint16 type but accept a full uint16 range from function arguments while
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appending a fixed-length offset. This can lead to an integer overflow
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and unexpected behavior.
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Change the locals to size_t, and add a check during reasssignment.
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Bug: 273966636
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Test: atest bluetooth_test_gd_unit, net_test_stack_btm
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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:53f64274cbf2268ad6db5af9c61ceead9ef64fb0)
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Merged-In: Iff252f0dd06aac9776e8548631e0b700b3ed85b9
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Change-Id: Iff252f0dd06aac9776e8548631e0b700b3ed85b9
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---
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stack/gatt/gatt_sr.cc | 17 ++++++++++++-----
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1 file changed, 12 insertions(+), 5 deletions(-)
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diff --git a/stack/gatt/gatt_sr.cc b/stack/gatt/gatt_sr.cc
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index b9921fee6..d4e3c046b 100644
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--- a/stack/gatt/gatt_sr.cc
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+++ b/stack/gatt/gatt_sr.cc
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@@ -113,7 +113,8 @@ void gatt_dequeue_sr_cmd(tGATT_TCB& tcb) {
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******************************************************************************/
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static bool process_read_multi_rsp(tGATT_SR_CMD* p_cmd, tGATT_STATUS status,
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tGATTS_RSP* p_msg, uint16_t mtu) {
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- uint16_t ii, total_len, len;
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+ uint16_t ii;
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+ size_t total_len, len;
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uint8_t* p;
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bool is_overflow = false;
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@@ -168,16 +169,22 @@ static bool process_read_multi_rsp(tGATT_SR_CMD* p_cmd, tGATT_STATUS status,
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len = p_rsp->attr_value.len - (total_len - mtu);
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is_overflow = true;
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VLOG(1) << StringPrintf(
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- "multi read overflow available len=%d val_len=%d", len,
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+ "multi read overflow available len=%zu val_len=%d", len,
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p_rsp->attr_value.len);
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} else {
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len = p_rsp->attr_value.len;
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}
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if (p_rsp->attr_value.handle == p_cmd->multi_req.handles[ii]) {
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- memcpy(p, p_rsp->attr_value.value, len);
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- if (!is_overflow) p += len;
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- p_buf->len += len;
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+ // check for possible integer overflow
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+ if (p_buf->len + len <= UINT16_MAX) {
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+ memcpy(p, p_rsp->attr_value.value, len);
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+ if (!is_overflow) p += len;
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+ p_buf->len += len;
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+ } else {
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+ p_cmd->status = GATT_NOT_FOUND;
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+ break;
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+ }
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} else {
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p_cmd->status = GATT_NOT_FOUND;
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break;
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