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Avoid accessing shared memory after it has been deleted

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This commit is contained in:
Bill Somerville 2020-08-11 20:07:00 +01:00
parent e27b09b590
commit 185f570136
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GPG Key ID: D864B06D1E81618F
1 changed files with 59 additions and 55 deletions
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114
widgets/mainwindow.cpp
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@ -3137,56 +3137,58 @@ void MainWindow::decode() //decode()
//newdat=1 ==> this is new data, must do the big FFT
//nagain=1 ==> decode only at fQSO +/- Tol
char *to = (char*)mem_jt9->data();
char *from = (char*) dec_data.ipc;
int size=sizeof(struct dec_data);
if(dec_data.params.newdat==0) {
int noffset {offsetof (struct dec_data, params.nutc)};
to += noffset;
from += noffset;
size -= noffset;
}
if(m_mode=="ISCAT" or m_mode=="MSK144" or m_bFast9) {
float t0=m_t0;
float t1=m_t1;
qApp->processEvents(); //Update the waterfall
if(m_nPick > 0) {
t0=m_t0Pick;
t1=m_t1Pick;
if (auto * to = reinterpret_cast<char *> (mem_jt9->data()))
{
char *from = (char*) dec_data.ipc;
int size=sizeof(struct dec_data);
if(dec_data.params.newdat==0) {
int noffset {offsetof (struct dec_data, params.nutc)};
to += noffset;
from += noffset;
size -= noffset;
}
if(m_mode=="ISCAT" or m_mode=="MSK144" or m_bFast9) {
float t0=m_t0;
float t1=m_t1;
qApp->processEvents(); //Update the waterfall
if(m_nPick > 0) {
t0=m_t0Pick;
t1=m_t1Pick;
}
static short int d2b[360000];
narg[0]=dec_data.params.nutc;
if(m_kdone>int(12000.0*m_TRperiod)) {
m_kdone=int(12000.0*m_TRperiod);
}
narg[1]=m_kdone;
narg[2]=m_nSubMode;
narg[3]=dec_data.params.newdat;
narg[4]=dec_data.params.minSync;
narg[5]=m_nPick;
narg[6]=1000.0*t0;
narg[7]=1000.0*t1;
narg[8]=2; //Max decode lines per decode attempt
if(dec_data.params.minSync<0) narg[8]=50;
if(m_mode=="ISCAT") narg[9]=101; //ISCAT
if(m_mode=="JT9") narg[9]=102; //Fast JT9
if(m_mode=="MSK144") narg[9]=104; //MSK144
narg[10]=ui->RxFreqSpinBox->value();
narg[11]=ui->sbFtol->value ();
narg[12]=0;
narg[13]=-1;
narg[14]=m_config.aggressive();
memcpy(d2b,dec_data.d2,2*360000);
watcher3.setFuture (QtConcurrent::run (std::bind (fast_decode_,&d2b[0],
&narg[0],&m_TRperiod,&m_msg[0][0],
dec_data.params.mycall,dec_data.params.hiscall,8000,12,12)));
} else {
mem_jt9->lock ();
memcpy(to, from, qMin(mem_jt9->size(), size));
mem_jt9->unlock ();
to_jt9(m_ihsym,1,-1); //Send m_ihsym to jt9[.exe] and start decoding
decodeBusy(true);
}
}
static short int d2b[360000];
narg[0]=dec_data.params.nutc;
if(m_kdone>int(12000.0*m_TRperiod)) {
m_kdone=int(12000.0*m_TRperiod);
}
narg[1]=m_kdone;
narg[2]=m_nSubMode;
narg[3]=dec_data.params.newdat;
narg[4]=dec_data.params.minSync;
narg[5]=m_nPick;
narg[6]=1000.0*t0;
narg[7]=1000.0*t1;
narg[8]=2; //Max decode lines per decode attempt
if(dec_data.params.minSync<0) narg[8]=50;
if(m_mode=="ISCAT") narg[9]=101; //ISCAT
if(m_mode=="JT9") narg[9]=102; //Fast JT9
if(m_mode=="MSK144") narg[9]=104; //MSK144
narg[10]=ui->RxFreqSpinBox->value();
narg[11]=ui->sbFtol->value ();
narg[12]=0;
narg[13]=-1;
narg[14]=m_config.aggressive();
memcpy(d2b,dec_data.d2,2*360000);
watcher3.setFuture (QtConcurrent::run (std::bind (fast_decode_,&d2b[0],
&narg[0],&m_TRperiod,&m_msg[0][0],
dec_data.params.mycall,dec_data.params.hiscall,8000,12,12)));
} else {
mem_jt9->lock ();
memcpy(to, from, qMin(mem_jt9->size(), size));
mem_jt9->unlock ();
to_jt9(m_ihsym,1,-1); //Send m_ihsym to jt9[.exe] and start decoding
decodeBusy(true);
}
}
void::MainWindow::fast_decode_done()
@ -3234,12 +3236,14 @@ void::MainWindow::fast_decode_done()
void MainWindow::to_jt9(qint32 n, qint32 istart, qint32 idone)
{
dec_data_t * dd = reinterpret_cast<dec_data_t *> (mem_jt9->data());
mem_jt9->lock ();
dd->ipc[0]=n;
if(istart>=0) dd->ipc[1]=istart;
if(idone>=0) dd->ipc[2]=idone;
mem_jt9->unlock ();
if (auto * dd = reinterpret_cast<dec_data_t *> (mem_jt9->data()))
{
mem_jt9->lock ();
dd->ipc[0]=n;
if(istart>=0) dd->ipc[1]=istart;
if(idone>=0) dd->ipc[2]=idone;
mem_jt9->unlock ();
}
}
void MainWindow::decodeDone ()