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Don't try to read from invalid file descriptors in QProcess

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strace reveals that we do ioctl(-1, FIONREAD) and get EBADF. The only
case where this could happen is inside _q_processDied, which calls the
read functions without checking if the pipe is still open.

Change-Id: I67637fc4267be73fc03d40c444fdfea89e1ef715
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
This commit is contained in:
Thiago Macieira 2014-06-05 17:15:03 -07:00 committed by The Qt Project
parent 25ef58fe18
commit 6ca3ab626a
3 changed files with 10 additions and 6 deletions
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3
src/corelib/io/qprocess.cpp
View File

@ -903,6 +903,9 @@ void QProcessPrivate::cleanup()
bool QProcessPrivate::tryReadFromChannel(Channel *channel)
{
Q_Q(QProcess);
if (channel->pipe[0] == INVALID_Q_PIPE)
return false;
qint64 available = bytesAvailableInChannel(channel);
if (available == 0) {
if (channel->notifier)

2
src/corelib/io/qprocess_unix.cpp
View File

@ -965,6 +965,7 @@ bool QProcessPrivate::processStarted()
qint64 QProcessPrivate::bytesAvailableInChannel(const Channel *channel) const
{
Q_ASSERT(channel->pipe[0] != INVALID_Q_PIPE);
int nbytes = 0;
qint64 available = 0;
if (::ioctl(channel->pipe[0], FIONREAD, (char *) &nbytes) >= 0)
@ -977,6 +978,7 @@ qint64 QProcessPrivate::bytesAvailableInChannel(const Channel *channel) const
qint64 QProcessPrivate::readFromChannel(const Channel *channel, char *data, qint64 maxlen)
{
Q_ASSERT(channel->pipe[0] != INVALID_Q_PIPE);
qint64 bytesRead = qt_safe_read(channel->pipe[0], data, maxlen);
#if defined QPROCESS_DEBUG
qDebug("QProcessPrivate::readFromChannel(%d, %p \"%s\", %lld) == %lld",

11
src/corelib/io/qprocess_win.cpp
View File

@ -566,11 +566,8 @@ bool QProcessPrivate::processStarted()
qint64 QProcessPrivate::bytesAvailableInChannel(const Channel *channel) const
{
if (channel->pipe[0] == INVALID_Q_PIPE)
return 0;
if (!channel->reader)
return 0;
Q_ASSERT(channel->pipe[0] != INVALID_Q_PIPE);
Q_ASSERT(channel->reader);
DWORD bytesAvail = channel->reader->bytesAvailable();
#if defined QPROCESS_DEBUG
@ -581,7 +578,9 @@ qint64 QProcessPrivate::bytesAvailableInChannel(const Channel *channel) const
qint64 QProcessPrivate::readFromChannel(const Channel *channel, char *data, qint64 maxlen)
{
return channel->reader ? channel->reader->read(data, maxlen) : 0;
Q_ASSERT(channel->pipe[0] != INVALID_Q_PIPE);
Q_ASSERT(channel->reader);
return channel->reader->read(data, maxlen);
}
static BOOL QT_WIN_CALLBACK qt_terminateApp(HWND hwnd, LPARAM procId)