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From 78e38f59ad9f7fbb6a68a5f254aec7d9bae428c3 Mon Sep 17 00:00:00 2001 | |
From: Ben Noordhuis <info@bnoordhuis.nl> | |
Date: Sat, 25 Oct 2014 07:27:21 +0200 | |
Subject: [PATCH] src: fix uninitialized memory dereference | |
The elements of the heap-allocated TaskQueue::ring_ array in | |
src/node_v8_platform.cc were compared against without being | |
initialized first. | |
Fixes node-forward/node#33. | |
PR-URL: https://github.com/node-forward/node/pull/34 | |
Reviewed-By: Fedor Indutny <fedor@indutny.com> | |
--- | |
src/node_v8_platform.cc | 14 ++++---------- | |
src/node_v8_platform.h | 8 +++++--- | |
2 files changed, 9 insertions(+), 13 deletions(-) | |
diff --git a/src/node_v8_platform.cc b/src/node_v8_platform.cc | |
index d71fdd4..aed4661 100644 | |
--- a/src/node_v8_platform.cc | |
+++ b/src/node_v8_platform.cc | |
@@ -98,12 +98,9 @@ void Platform::WorkerBody(void* arg) { | |
TaskQueue::TaskQueue() { | |
int err; | |
- static_assert(kRingSize == (kRingSize & (~(kRingSize - 1))), | |
- "kRingSize is not a power of two"); | |
+ for (size_t i = 0; i < ARRAY_SIZE(ring_); i += 1) | |
+ ring_[i] = nullptr; | |
- size_ = kRingSize; | |
- ring_ = new Task*[size_]; | |
- mask_ = size_ - 1; | |
read_off_ = 0; | |
write_off_ = 0; | |
@@ -120,9 +117,6 @@ TaskQueue::TaskQueue() { | |
TaskQueue::~TaskQueue() { | |
CHECK_EQ(read_off_, write_off_); | |
- | |
- delete[] ring_; | |
- ring_ = nullptr; | |
uv_sem_destroy(&sem_); | |
uv_cond_destroy(&cond_); | |
uv_mutex_destroy(&mutex_); | |
@@ -138,7 +132,7 @@ void TaskQueue::Push(Task* task) { | |
ring_[write_off_] = task; | |
write_off_++; | |
- write_off_ &= mask_; | |
+ write_off_ &= kRingMask; | |
uv_mutex_unlock(&mutex_); | |
uv_sem_post(&sem_); | |
@@ -154,7 +148,7 @@ Task* TaskQueue::Shift() { | |
uv_cond_signal(&cond_); | |
read_off_++; | |
- read_off_ &= mask_; | |
+ read_off_ &= kRingMask; | |
uv_mutex_unlock(&mutex_); | |
return task; | |
diff --git a/src/node_v8_platform.h b/src/node_v8_platform.h | |
index 59bcdae..a51c3a1 100644 | |
--- a/src/node_v8_platform.h | |
+++ b/src/node_v8_platform.h | |
@@ -37,15 +37,17 @@ class TaskQueue { | |
private: | |
static const unsigned int kRingSize = 1024; | |
+ static const unsigned int kRingMask = kRingSize - 1; | |
+ | |
+ static_assert(kRingSize == (kRingSize & ~kRingMask), | |
+ "kRingSize is not a power of two"); | |
uv_sem_t sem_; | |
uv_cond_t cond_; | |
uv_mutex_t mutex_; | |
- v8::Task** ring_; | |
- unsigned int size_; | |
- unsigned int mask_; | |
unsigned int read_off_; | |
unsigned int write_off_; | |
+ v8::Task* ring_[kRingSize]; | |
}; | |
class Platform : public v8::Platform { |
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