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Merge topic 'fix-variable_watch-reallocation' 

c6104028 Avoid occasional use-after-free when a variable watch is executed
This commit is contained in:
Brad King 2016-03-24 08:49:46 -04:00 committed by CMake Topic Stage
parent 917d49ed93 c610402825
commit 6d36fc8341
3 changed files with 19 additions and 10 deletions
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23
Source/cmMakefile.cxx
View File

@ -2503,15 +2503,22 @@ const char* cmMakefile::GetDefinition(const std::string& name) const
cmVariableWatch* vv = this->GetVariableWatch();
if ( vv && !this->SuppressWatches )
{
if ( def )
{
vv->VariableAccessed(name, cmVariableWatch::VARIABLE_READ_ACCESS,
def, this);
}
else
{
bool const watch_function_executed =
vv->VariableAccessed(name,
cmVariableWatch::UNKNOWN_VARIABLE_READ_ACCESS, def, this);
def ? cmVariableWatch::VARIABLE_READ_ACCESS
: cmVariableWatch::UNKNOWN_VARIABLE_READ_ACCESS,
def, this);
if (watch_function_executed)
{
// A callback was executed and may have caused re-allocation of the
// variable storage. Look it up again for now.
// FIXME: Refactor variable storage to avoid this problem.
def = this->StateSnapshot.GetDefinition(name);
if(!def)
{
def = this->GetState()->GetInitializedCacheValue(name);
}
}
}
#endif

4
Source/cmVariableWatch.cxx
View File

@ -96,7 +96,7 @@ void cmVariableWatch::RemoveWatch(const std::string& variable,
}
}
void cmVariableWatch::VariableAccessed(const std::string& variable,
bool cmVariableWatch::VariableAccessed(const std::string& variable,
int access_type,
const char* newValue,
const cmMakefile* mf) const
@ -112,5 +112,7 @@ void cmVariableWatch::VariableAccessed(const std::string& variable,
(*it)->Method(variable, access_type, (*it)->ClientData,
newValue, mf);
}
return true;
}
return false;
}

2
Source/cmVariableWatch.h
View File

@ -42,7 +42,7 @@ public:
/**
* This method is called when variable is accessed
*/
void VariableAccessed(const std::string& variable, int access_type,
bool VariableAccessed(const std::string& variable, int access_type,
const char* newValue, const cmMakefile* mf) const;
/**