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NCOF: secure possible index overflow by 1 due to float to int conversion

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This commit is contained in:
f4exb 2018-02-15 23:58:01 +01:00
parent ae8eddbfda
commit 34081dd50b
2 changed files with 12 additions and 6 deletions
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9
sdrbase/dsp/ncof.cpp
View File

@ -23,16 +23,19 @@
#undef M_PI
#define M_PI 3.14159265358979323846
Real NCOF::m_table[NCOF::TableSize];
Real NCOF::m_table[NCOF::TableSize+1];
bool NCOF::m_tableInitialized = false;
float NCOF::m_tableSizeLimit = (float) NCOF::TableSize;
void NCOF::initTable()
{
if(m_tableInitialized)
if(m_tableInitialized) {
return;
}
for(int i = 0; i < TableSize; i++)
for(int i = 0; i <= TableSize; i++) {
m_table[i] = cos((2.0 * M_PI * i) / TableSize);
}
m_tableInitialized = true;
}

9
sdrbase/dsp/ncof.h
View File

@ -25,8 +25,9 @@ private:
enum {
TableSize = (1 << 12),
};
static Real m_table[TableSize];
static Real m_table[TableSize+1];
static bool m_tableInitialized;
static float m_tableSizeLimit;
static void initTable();
@ -42,10 +43,12 @@ public:
int nextPhase() //!< Increment phase and return its integer value
{
m_phase += m_phaseIncrement;
while(m_phase >= TableSize)
while(m_phase >= m_tableSizeLimit) {
m_phase -= TableSize;
while(m_phase < 0)
}
while(m_phase < 0.0) {
m_phase += TableSize;
}
return (int) m_phase;
}