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fix undefined behavour due to memcpy(ptr, NULL, 0) #59

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fix undefined behavour due to memcpy(ptr, NULL, 0) #59

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53 changes: 13 additions & 40 deletions src/CglCommon/CglTreeInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1013,25 +1013,13 @@ CglTreeProbingInfo::analyze(const OsiSolverInterface &si, int createSolver,
nStrengthen++;
if (numberEntries + jCount + 1 > maximumEntries) {
maximumEntries = CoinMax(numberEntries + jCount + 1, (maximumEntries * 12) / 10 + 100);
CliqueEntry *temp = new CliqueEntry[maximumEntries];
memcpy(temp, entry, numberEntries * sizeof(CliqueEntry));
delete[] entry;
entry = temp;
int *tempI = new int[maximumEntries];
memcpy(tempI, whichClique, numberEntries * sizeof(int));
delete[] whichClique;
whichClique = tempI;
append(entry, numberEntries, maximumEntries);
append(whichClique, numberEntries, maximumEntries);
}
if (numberCliques == maximumCliques) {
maximumCliques = (maximumCliques * 12) / 10 + 100;
CoinBigIndex *temp = new CoinBigIndex[maximumCliques + 1];
memcpy(temp, cliqueStart, (numberCliques + 1) * sizeof(CoinBigIndex));
delete[] cliqueStart;
cliqueStart = temp;
char *tempT = new char[maximumCliques];
memcpy(tempT, cliqueType, numberCliques);
delete[] cliqueType;
cliqueType = tempT;
append(cliqueStart, numberCliques + 1, maximumCliques + 1);
append(cliqueType, numberCliques, maximumCliques);
}
CliqueEntry eI;
eI.fixes = 0;
Expand Down Expand Up @@ -1102,25 +1090,14 @@ CglTreeProbingInfo::analyze(const OsiSolverInterface &si, int createSolver,
nStrengthen++;
if (numberEntries + jCount + 1 > maximumEntries) {
maximumEntries = CoinMax(numberEntries + jCount + 1, (maximumEntries * 12) / 10 + 100);
CliqueEntry *temp = new CliqueEntry[maximumEntries];
memcpy(temp, entry, numberEntries * sizeof(CliqueEntry));
delete[] entry;
entry = temp;
int *tempI = new int[maximumEntries];
memcpy(tempI, whichClique, numberEntries * sizeof(int));
delete[] whichClique;
whichClique = tempI;
append(entry, numberEntries, maximumEntries);
append(whichClique, numberEntries, maximumEntries);
}
if (numberCliques == maximumCliques) {
maximumCliques = (maximumCliques * 12) / 10 + 100;
CoinBigIndex *temp = new CoinBigIndex[maximumCliques + 1];
memcpy(temp, cliqueStart, (numberCliques + 1) * sizeof(CoinBigIndex));
delete[] cliqueStart;
cliqueStart = temp;
char *tempT = new char[maximumCliques];
memcpy(tempT, cliqueType, numberCliques);
delete[] cliqueType;
cliqueType = tempT;

append(cliqueStart, numberCliques + 1, maximumCliques + 1);
append(cliqueType, numberCliques, maximumCliques);
}
CliqueEntry eI;
eI.fixes = 0;
Expand Down Expand Up @@ -1232,6 +1209,7 @@ CglTreeProbingInfo::analyze(const OsiSolverInterface &si, int createSolver,
delete[] whichClique;
return newSolver;
}

// Take action if cut generator can fix a variable (toValue -1 for down, +1 for up)
bool CglTreeProbingInfo::fixes(int variable, int toValue, int fixedVariable, bool fixedToLower)
{
Expand All @@ -1248,14 +1226,9 @@ bool CglTreeProbingInfo::fixes(int variable, int toValue, int fixedVariable, boo
if (maximumEntries_ >= CoinMax(1000000, 10 * numberIntegers_))
return false;
maximumEntries_ += 100 + maximumEntries_ / 2;
CliqueEntry *temp1 = new CliqueEntry[maximumEntries_];
memcpy(temp1, fixEntry_, numberEntries_ * sizeof(CliqueEntry));
delete[] fixEntry_;
fixEntry_ = temp1;
int *temp2 = new int[maximumEntries_];
memcpy(temp2, fixingEntry_, numberEntries_ * sizeof(int));
delete[] fixingEntry_;
fixingEntry_ = temp2;

append(fixEntry_, numberEntries_, maximumEntries_);
append(fixingEntry_, numberEntries_, maximumEntries_);
}
CliqueEntry entry1;
entry1.fixes = 0;
Expand Down
14 changes: 14 additions & 0 deletions src/CglCommon/CglTreeInfo.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,20 @@
#include "CoinHelperFunctions.hpp"
#include "CglConfig.h"

template<typename T>
void append(T*& array, int oldLength, int newLength)
{
assert(oldLength < newLength);

T* temp = new T[newLength];
if (array != NULL) {
memcpy(temp, array, oldLength * sizeof(T));
delete[] array;
}

array = temp;
}

class CglStored;
/** Information about where the cut generator is invoked from. */

Expand Down
9 changes: 4 additions & 5 deletions src/CglPreProcess/CglPreProcess.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2797,7 +2797,9 @@ CglPreProcess::preProcessNonDefault(OsiSolverInterface &model,
int nAdd = ((tuning & (64 + USECGLCLIQUE)) == 64 + USECGLCLIQUE && allPlusOnes) ? 2 : 1;
CglCutGenerator **temp = generator_;
generator_ = new CglCutGenerator *[numberCutGenerators_ + nAdd];
memcpy(generator_ + nAdd, temp, numberCutGenerators_ * sizeof(CglCutGenerator *));
if(temp != NULL) {
memcpy(generator_ + nAdd, temp, numberCutGenerators_ * sizeof(CglCutGenerator *));
}
delete[] temp;
numberCutGenerators_ += nAdd;
if (nAdd == 2 || (tuning & USECGLCLIQUE) != 0) {
Expand Down Expand Up @@ -7938,10 +7940,7 @@ void CglPreProcess::gutsOfDestructor()
// Add one generator
void CglPreProcess::addCutGenerator(CglCutGenerator *generator)
{
CglCutGenerator **temp = generator_;
generator_ = new CglCutGenerator *[numberCutGenerators_ + 1];
memcpy(generator_, temp, numberCutGenerators_ * sizeof(CglCutGenerator *));
delete[] temp;
append(generator_, numberCutGenerators_, numberCutGenerators_ + 1);
generator_[numberCutGenerators_++] = generator->clone();
}
//#############################################################################
Expand Down