mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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66 lines
2.6 KiB
Diff
66 lines
2.6 KiB
Diff
From 5c77ea08c49728abbd5cbadd0b4f473d2fe6fa1b Mon Sep 17 00:00:00 2001
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From: Devin Moore <devinmoore@google.com>
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Date: Mon, 22 Jan 2024 17:52:16 +0000
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Subject: [PATCH] Use the values of the ptrs that we check
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Test: fmq_fuzzer
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Bug: 321326147
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Bug: 321341508
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Bug: 321383085
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(cherry picked from https://android-review.googlesource.com/q/commit:38963310ad5789b625ca0bca9f9c2c8e24666651)
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:af19e0ef034174afd794563552f91303fd9f1529)
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Merged-In: I56fe4fe72180e39ecef066353969c1ae9fbcd44e
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Change-Id: I56fe4fe72180e39ecef066353969c1ae9fbcd44e
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---
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include/fmq/MessageQueue.h | 25 ++++++++++++++++++++-----
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1 file changed, 20 insertions(+), 5 deletions(-)
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diff --git a/include/fmq/MessageQueue.h b/include/fmq/MessageQueue.h
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index 7be7151..6cf8f3f 100644
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--- a/include/fmq/MessageQueue.h
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+++ b/include/fmq/MessageQueue.h
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@@ -968,8 +968,16 @@ bool MessageQueue<T, flavor>::readBlocking(T* data, size_t count, int64_t timeOu
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}
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template <typename T, MQFlavor flavor>
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-size_t MessageQueue<T, flavor>::availableToWriteBytes() const {
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- return mDesc->getSize() - availableToReadBytes();
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+inline size_t MessageQueue<T, flavor>::availableToWriteBytes() const {
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+ size_t queueSizeBytes = mDesc->getSize();
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+ size_t availableBytes = availableToReadBytes();
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+ if (queueSizeBytes < availableBytes) {
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+ hardware::details::logError(
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+ "The write or read pointer has become corrupted. Reading from the queue is no "
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+ "longer possible.");
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+ return 0;
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+ }
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+ return queueSizeBytes - availableBytes;
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}
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template <typename T, MQFlavor flavor>
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@@ -1050,14 +1058,21 @@ bool MessageQueue<T, flavor>::commitWrite(size_t nMessages) {
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}
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template <typename T, MQFlavor flavor>
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-size_t MessageQueue<T, flavor>::availableToReadBytes() const {
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+inline size_t MessageQueue<T, flavor>::availableToReadBytes() const {
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/*
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* This method is invoked by implementations of both read() and write() and
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* hence requries a memory_order_acquired load for both mReadPtr and
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* mWritePtr.
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*/
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- return mWritePtr->load(std::memory_order_acquire) -
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- mReadPtr->load(std::memory_order_acquire);
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+ uint64_t writePtr = mWritePtr->load(std::memory_order_acquire);
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+ uint64_t readPtr = mReadPtr->load(std::memory_order_acquire);
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+ if (writePtr < readPtr) {
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+ hardware::details::logError(
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+ "The write or read pointer has become corrupted. Reading from the queue is no "
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+ "longer possible.");
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+ return 0;
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+ }
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+ return writePtr - readPtr;
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}
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template <typename T, MQFlavor flavor>
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