[Webkit-unassigned] [Bug 36142] New: [Qt] MediaPlayerPrivate: don't crash when no media services can be found.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36142

           Summary: [Qt] MediaPlayerPrivate: don't crash when no media
                    services can be found.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P3
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jwieczorek at webkit.org


When no media services for QtMultimedia are installed, Qt outputs this to
stderr:
defaultServiceProvider::requestService(): no service found for -
"com.nokia.qt.mediaplayer",
and then in some situations QtWebKit would crash. In my case it was crashing in
MediaPlayerPrivate::buffered(), with the following backtrace:

(gdb) frame 0
#0  0x00007ffff70db13b in WebCore::MediaPlayerPrivate::buffered (this=0xc16390)
at ../../../WebCore/platform/graphics/qt/MediaPlayerPrivateQt.cpp:303
303         QMediaTimeRange playbackRanges =
m_mediaPlayerControl->availablePlaybackRanges();
#1  0x00007ffff70cc4ed in WebCore::MediaPlayer::buffered (this=0xebc520) at
../../../WebCore/platform/graphics/MediaPlayer.cpp:455
No locals.
#2  0x00007ffff6ff1510 in WebCore::RenderThemeQt::paintMediaSliderTrack
(this=0x810510, o=0x13627f8, paintInfo=..., r=...) at
../../../WebCore/platform/qt/RenderThemeQt.cpp:1118
        buffered = {m_ptr = 0x7fffffffb2c0}
        player = 0xebc520
        mediaElement = <value optimized out>
        p = {painter = 0x7fffffffc490, widget = 0x88dbb0, style = 0x7d6060,
oldBrush = {d = {d = 0xd25d50}}, oldAntialiasing = true}

m_mediaPlayerControl is not null there, even though it should:

(gdb) print m_mediaPlayerControl
$1 = (class QMediaPlayerControl *) 0x1a400000088

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