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moodbar: check QSlider max/min before using them in division 

When switching playback from an item for which the moodbar is not
displayed (e.g. an internet stream), to an item for which it is
displayed (e.g. a local mp3 file), Clementine sometimes crashes.

This happens because the slider_opt->maximum and slider_opt->minimum
have the value 0 (their default value), and the difference is used as a
divisor.  This gives a division by 0, and a SIGFPE.

This problem has been fixed in commit af42cce.  However, when a9f9b0e
reverted 3f79fa5, a little to much was reverted and we lost what af42cce
did.  This patch re-introduces the fix.

Fixes #5261

moodbar: Add comment
(cherry picked from commit 725e1d8f0d)
This commit is contained in:
Simon Marchi 2016-02-18 08:54:04 -05:00 committed by John Maguire
parent 8d2911bc32
commit 89e3d9851e
1 changed files with 8 additions and 3 deletions
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11
src/moodbar/moodbarproxystyle.cpp
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@ -270,10 +270,15 @@ QRect MoodbarProxyStyle::subControlRect(ComplexControl cc,
case SC_SliderHandle: {
const QStyleOptionSlider* slider_opt =
qstyleoption_cast<const QStyleOptionSlider*>(opt);
int x = 0;
const int x = (slider_opt->sliderValue - slider_opt->minimum) *
(opt->rect.width() - kArrowWidth) /
(slider_opt->maximum - slider_opt->minimum);
/* slider_opt->{maximum,minimum} can have the value 0 (their default
values), so this check avoids a division by 0. */
if (slider_opt->maximum > slider_opt->minimum) {
x = (slider_opt->sliderValue - slider_opt->minimum) *
(opt->rect.width() - kArrowWidth) /
(slider_opt->maximum - slider_opt->minimum);
}
return QRect(QPoint(opt->rect.left() + x, opt->rect.top()),
QSize(kArrowWidth, kArrowHeight));