Memory issue in libcomposeplatforminputcontextplugin

=================================================================
==31539== ERROR: AddressSanitizer: heap-use-after-free on address 0x60080002ace8 at pc 0x7f45b1f31d95 bp 0x7fffadd4cb00 sp 0x7fffadd4cac8
READ of size 1 at 0x60080002ace8 thread T0
    #0 0x7f45b1f31d94 (/usr/local/gcc-4.8.0/lib64/libasan.so.0.0.0+0x10d94)
    #1 0x7f45b0f0da07 (/lib64/libc-2.17.so+0x36a07)
    #2 0x7f45a83a68ae (/usr/lib64/libxkbcommon.so.0.0.0+0x378ae)
    #3 0x7f45a85dca65 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xaa65)
    #4 0x7f45a85dd5e9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xb5e9)
    #5 0x7f45a85dc3c4 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xa3c4)
    #6 0x7f45a85dc0e0 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xa0e0)
    #7 0x7f45a85db659 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x9659)
    #8 0x7f45a85daed3 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x8ed3)
    #9 0x7f45a85d85e9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x65e9)
    #10 0x7f45a85d7999 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x5999)
    #11 0x7f45b5b007c8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a27c8)
    #12 0x7f45b5affa48 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a1a48)
    #13 0x7f45b5affdd2 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a1dd2)
    #14 0x7f45aba582ce (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforms/libqxcb.so+0x5f2ce)
    #15 0x7f45aba89bd8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforms/libqxcb.so+0x90bd8)
    #16 0x7f45b5b05e19 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a7e19)
    #17 0x7f45b5b05265 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a7265)
    #18 0x7f45b5b12d6a (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b4d6a)
    #19 0x7f45b5b144c7 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b64c7)
    #20 0x7f45b5b14558 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b6558)
    #21 0x7f45b7559a4f (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Widgets.so.5.1.0+0x2b6a4f)
    #22 0x7f45b52f11cf (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x4411cf)
    #23 0x7f45b52f0e67 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x440e67)
    #24 0x7f45b5b11320 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b3320)
    #25 0x7f45b748ede8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Widgets.so.5.1.0+0x1ebde8)
    #26 0x407c27 (/home/kkoehne/dev/creator-2.7-qt-5.1-gcc-4.8.0-64/bin/qtcreator+0x407c27)
    #27 0x40ef00 (/home/kkoehne/dev/creator-2.7-qt-5.1-gcc-4.8.0-64/bin/qtcreator+0x40ef00)
    #28 0x7f45b0ef8a14 (/lib64/libc-2.17.so+0x21a14)
    #29 0x407798 (/home/kkoehne/dev/creator-2.7-qt-5.1-gcc-4.8.0-64/bin/qtcreator+0x407798)
0x60080002ace8 is located 24 bytes inside of 35-byte region [0x60080002acd0,0x60080002acf3)
freed by thread T0 here:
    #0 0x7f45b1f36c5a (/usr/local/gcc-4.8.0/lib64/libasan.so.0.0.0+0x15c5a)
    #1 0x7f45b4fcfda9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x11fda9)
    #2 0x7f45a85dfc95 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xdc95)
    #3 0x7f45a85dea26 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xca26)
    #4 0x7f45a85dca54 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xaa54)
    #5 0x7f45a85dd5e9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xb5e9)
    #6 0x7f45a85dc3c4 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xa3c4)
    #7 0x7f45a85dc0e0 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xa0e0)
    #8 0x7f45a85db659 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x9659)
    #9 0x7f45a85daed3 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x8ed3)
    #10 0x7f45a85d85e9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x65e9)
    #11 0x7f45a85d7999 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x5999)
    #12 0x7f45b5b007c8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a27c8)
    #13 0x7f45b5affa48 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a1a48)
    #14 0x7f45b5affdd2 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a1dd2)
    #15 0x7f45aba582ce (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforms/libqxcb.so+0x5f2ce)
    #16 0x7f45aba89bd8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforms/libqxcb.so+0x90bd8)
    #17 0x7f45b5b05e19 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a7e19)
    #18 0x7f45b5b05265 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1a7265)
    #19 0x7f45b5b12d6a (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b4d6a)
    #20 0x7f45b5b144c7 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b64c7)
    #21 0x7f45b5b14558 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b6558)
    #22 0x7f45b7559a4f (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Widgets.so.5.1.0+0x2b6a4f)
    #23 0x7f45b52f11cf (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x4411cf)
    #24 0x7f45b52f0e67 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x440e67)
    #25 0x7f45b5b11320 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Gui.so.5.1.0+0x1b3320)
    #26 0x7f45b748ede8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Widgets.so.5.1.0+0x1ebde8)
    #27 0x407c27 (/home/kkoehne/dev/creator-2.7-qt-5.1-gcc-4.8.0-64/bin/qtcreator+0x407c27)
    #28 0x40ef00 (/home/kkoehne/dev/creator-2.7-qt-5.1-gcc-4.8.0-64/bin/qtcreator+0x40ef00)
    #29 0x7f45b0ef8a14 (/lib64/libc-2.17.so+0x21a14)
previously allocated by thread T0 here:
    #0 0x7f45b1f36d3a (/usr/local/gcc-4.8.0/lib64/libasan.so.0.0.0+0x15d3a)
    #1 0x7f45b4fcfb41 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x11fb41)
    #2 0x7f45b4fe1a5e (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x131a5e)
    #3 0x7f45b4fd49b8 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x1249b8)
    #4 0x7f45b51099bc (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x2599bc)
    #5 0x7f45b5109c34 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/lib/libQt5Core.so.5.1.0+0x259c34)
    #6 0x7f45a85dca38 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xaa38)
    #7 0x7f45a85dd5e9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xb5e9)
    #8 0x7f45a85dc3c4 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xa3c4)
    #9 0x7f45a85dc0e0 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0xa0e0)
    #10 0x7f45a85db659 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x9659)
    #11 0x7f45a85daed3 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x8ed3)
    #12 0x7f45a85d85e9 (/home/kkoehne/dev/qt/qt-5.1-gcc-4.8.0-64/qtbase/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so+0x65e9)