[k3b] [Bug 386983] Refresh button in the Programs section causes segfault

[Leslie Zhai]

https://bugs.kde.org/show_bug.cgi?id=386983

--- Comment #6 from Leslie Zhai <lesliezhai at llvm.org.cn> ---
Created attachment 109022
  --> https://bugs.kde.org/attachment.cgi?id=109022&action=edit
sanitizer.log

1. UndefinedBehaviorSanitizer: undefined-behavior
/data/project/kde/k3b/src/option/k3bexternalbinpermissionmodel.cpp:109:44 in 
/data/project/kde/k3b/libk3b/core/k3bexternalbinmanager.cpp:117:12: runtime
error: member access within address 0x6020001c9ab0 which does not point to an
object of type 'const K3b::ExternalBin'
0x6020001c9ab0: note: object has invalid vptr

2. AddressSanitizer: heap-use-after-free on address 0x6020001c9ab8 at pc
0x7f7f6d951526 bp 0x7ffe4852c8b0 sp 0x7ffe4852c8a8
READ of size 8 at 0x6020001c9ab8 thread T0                                      
    #0 0x7f7f6d951525 in K3b::ExternalBin::path() const
/data/project/kde/k3b/libk3b/core/k3bexternalbinmanager.cpp:117:12

3. 0x6020001c9ab8 is located 8 bytes inside of 16-byte region
[0x6020001c9ab0,0x6020001c9ac0)
freed by thread T0 here:                                                        
    #0 0x58f5fb in operator delete(void*)
/data/project/llvm/projects/compiler-rt/lib/asan/asan_new_delete.cc:149:3
    #1 0x7f7f6d9508f7 in K3b::ExternalBin::~ExternalBin()
/data/project/kde/k3b/libk3b/core/k3bexternalbinmanager.cpp:74:1

4. previously allocated by thread T0 here:                                      
    #0 0x58e99b in operator new(unsigned long)
/data/project/llvm/projects/compiler-rt/lib/asan/asan_new_delete.cc:92:3
    #1 0x7f7f6d956482 in K3b::SimpleExternalProgram::scan(QString const&)
/data/project/kde/k3b/libk3b/core/k3bexternalbinmanager.cpp:346:33



Workaround patch is remove delete to bring in Memory-leak issue, but I want to
find the root cause instead!

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