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https://github.com/Divested-Mobile/DivestOS-Build.git
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33 lines
1.2 KiB
Diff
33 lines
1.2 KiB
Diff
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From 5f01e7f21f155a6b13a5ce659bac1fc03735a5e9 Mon Sep 17 00:00:00 2001
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From: Ken Chen <cken@google.com>
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Date: Sat, 26 Jan 2019 19:17:00 +0800
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Subject: [PATCH] Clear Element.mRef immediately after deallocating it
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DNSServiceRefDeallocate() and pointer dereferencing in request handler
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thread are protected by two separate lock/unlock pairs on mHeadMutex.
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If rescan() runs between these, it could dereference mRef, causing
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a heap-use-after-free bug.
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Solution: set mRef to null immediately after freeing it.
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Bug: 121327565
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Test: build
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Change-Id: I56ace2ad8a2da528afa375aefb1b9420547658a7
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(cherry picked from commit 9762bc1964a37ec56091ee2b6070e19c5206f615)
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---
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server/MDnsSdListener.cpp | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/server/MDnsSdListener.cpp b/server/MDnsSdListener.cpp
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index e3fd66a0..563e0207 100644
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--- a/server/MDnsSdListener.cpp
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+++ b/server/MDnsSdListener.cpp
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@@ -775,5 +775,6 @@ void MDnsSdListener::Monitor::freeServiceRef(int id) {
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void MDnsSdListener::Monitor::deallocateServiceRef(DNSServiceRef* ref) {
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pthread_mutex_lock(&mHeadMutex);
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DNSServiceRefDeallocate(*ref);
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+ *ref = nullptr;
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pthread_mutex_unlock(&mHeadMutex);
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}
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\ No newline at end of file
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