HelperSupport: don't send debug message on application shutting down
This fixes a use-after-free.
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==4549==ERROR: AddressSanitizer: heap-use-after-free on address 0x50c000012640 at pc 0x7f6455545708 bp 0x7fff84016860 sp 0x7fff84016858
READ of size 8 at 0x50c000012640 thread T0
#0 0x7f6455545707 in KAuth::HelperSupport::helperDebugHandler(QtMsgType, QMessageLogContext const&, QString const&) /builds/frameworks/kauth/src/helpersupport.cpp:129
#1 0x7f6452b0b4e6 in qt_message_output(QtMsgType, QMessageLogContext const&, QString const&) (/lib64/libQt6Core.so.6+0x1314e6) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
#2 0x7f6452b158c7 in QDebug::~QDebug() (/lib64/libQt6Core.so.6+0x13b8c7) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
#3 0x7f6452ddac0b (/lib64/libQt6Core.so.6+0x400c0b) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
#4 0x7f6452d9720b (/lib64/libQt6Core.so.6+0x3bd20b) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
#5 0x7f64525bf3c0 in __cxa_finalize (/lib64/libc.so.6+0x433c0) (BuildId: a2c0942c27fb9483b47886a1b937337a797bbceb)
#6 0x7f6452af4186 (/lib64/libQt6Core.so.6+0x11a186) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
0x50c000012640 is located 0 bytes inside of 120-byte region [0x50c000012640,0x50c0000126b8)
freed by thread T0 here:
#0 0x7f64557191f8 in operator delete(void*, unsigned long) (/usr/lib64/gcc/x86_64-suse-linux/13/libasan.so+0xfe1f8) (BuildId: 6b8377eed7514a2b9b24e752e250df1b9acad9ea)
#1 0x7f644946ac48 in KAuth::DBusHelperProxy::~DBusHelperProxy() /builds/frameworks/kauth/src/backends/dbus/DBusHelperProxy.cpp:44
#2 0x7f6452ddaa98 (/lib64/libQt6Core.so.6+0x400a98) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
previously allocated by thread T0 here:
#0 0x7f64557182f8 in operator new(unsigned long) (/usr/lib64/gcc/x86_64-suse-linux/13/libasan.so+0xfd2f8) (BuildId: 6b8377eed7514a2b9b24e752e250df1b9acad9ea)
#1 0x7f644947611a in qt_plugin_instance /builds/frameworks/kauth/_build/src/kauth_helper_plugin_autogen/include/moc_DBusHelperProxy.cpp:202
#2 0x7f6452d99af0 (/lib64/libQt6Core.so.6+0x3bfaf0) (BuildId: b08c7df7d9504a493ca888419658ddf2ba882e48)
SUMMARY: AddressSanitizer: heap-use-after-free /builds/frameworks/kauth/src/helpersupport.cpp:129 in KAuth::HelperSupport::helperDebugHandler(QtMsgType, QMessageLogContext const&, QString const&)
Shadow bytes around the buggy address:
0x50c000012380: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
0x50c000012400: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x50c000012480: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x50c000012500: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
0x50c000012580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fa
=>0x50c000012600: fa fa fa fa fa fa fa fa[fd]fd fd fd fd fd fd fd
0x50c000012680: fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa fa
0x50c000012700: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fa
0x50c000012780: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x50c000012800: fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa fa
0x50c000012880: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==4549==ABORTING
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