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Fix some empty vector references 

streams.h has some methods that can be tricked into dereferencing
null pointers or end() iterators. Fix this.

Github-Pull: #10250
Rebased-From: f478d98fe4
This commit is contained in:
Pieter Wuille 2017-04-13 02:33:04 -07:00 committed by Luke Dashjr
parent a40d69e0b8
commit e23cef0c94
1 changed files with 6 additions and 2 deletions
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8
src/streams.h
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@ -248,7 +248,8 @@ public:
void insert(iterator it, std::vector<char>::const_iterator first, std::vector<char>::const_iterator last)
{
assert(last - first >= 0);
if (last == first) return;
assert(last - first > 0);
if (it == vch.begin() + nReadPos && (unsigned int)(last - first) <= nReadPos)
{
// special case for inserting at the front when there's room
@ -261,7 +262,8 @@ public:
void insert(iterator it, const char* first, const char* last)
{
assert(last - first >= 0);
if (last == first) return;
assert(last - first > 0);
if (it == vch.begin() + nReadPos && (unsigned int)(last - first) <= nReadPos)
{
// special case for inserting at the front when there's room
@ -339,6 +341,8 @@ public:
void read(char* pch, size_t nSize)
{
if (nSize == 0) return;
// Read from the beginning of the buffer
unsigned int nReadPosNext = nReadPos + nSize;
if (nReadPosNext >= vch.size())