Partial revert of "Fix nullptr dereference bug in TList::RecursiveRem… #961
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…ove()" This partially revert commit 71b778c We can not use (directly) a for loop in RecursiveRemove as its deletes the object/iterator inside the loop: for (TObjLink *lnk = fFirst; lnk; lnk = lnk->Next()) { ... DeleteLink(lnk); } Resulting in : Processing tutorials/graphs/multipalette.C... (TCanvas *) 0x12fd08e0 ==7117== Invalid read of size 8 ==7117== at 0x5111612: TObjLink::Next() (TList.h:142) ==7117== by 0x51B74F4: TList::RecursiveRemove(TObject*) (TList.cxx:713) ==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143) ==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722) ==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143) ==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722) ==7117== by 0x51B96CB: THashList::RecursiveRemove(TObject*) (THashList.cxx:286) ==7117== by 0x514245A: TObject::~TObject() (TObject.cxx:88) ==7117== by 0x50EDC1D: TNamed::~TNamed() (TNamed.h:41) ==7117== by 0x14535B0F: TF1::~TF1() (TF1.cxx:827) ==7117== by 0x1454CA07: TF2::~TF2() (TF2.cxx:153) ==7117== by 0x1454CA3D: TF2::~TF2() (TF2.cxx:155) ==7117== by 0x51B09D4: TCollection::GarbageCollect(TObject*) (TCollection.cxx:748) ==7117== by 0x51B6BE8: TList::Delete(char const*) (TList.cxx:501) ==7117== by 0x518E05D: TROOT::EndOfProcessCleanups() (TROOT.cxx:1171) ==7117== by 0x524F659: TUnixSystem::Exit(int, bool) (TUnixSystem.cxx:2153) ==7117== by 0x5169BE1: TApplication::Terminate(int) (TApplication.cxx:1279) ==7117== by 0x4049925: TRint::Terminate(int) (TRint.cxx:686) ==7117== by 0x40486D5: TRint::Run(bool) (TRint.cxx:437) ==7117== by 0x4012AA: main (rmain.cxx:30) ==7117== Address 0x6e72ff8 is 8 bytes inside a block of size 56 free'd ==7117== at 0x4C2918D: operator delete(void*) (vg_replace_malloc.c:576) ==7117== by 0x51B8B11: TObjOptLink::~TObjOptLink() (TList.h:163) ==7117== by 0x51B6DAF: TList::DeleteLink(TObjLink*) (TList.cxx:530) ==7117== by 0x51B74C0: TList::RecursiveRemove(TObject*) (TList.cxx:742) ==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143) ==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722) ==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143) ==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722) ==7117== by 0x51B96CB: THashList::RecursiveRemove(TObject*) (THashList.cxx:286) ==7117== by 0x514245A: TObject::~TObject() (TObject.cxx:88) ==7117== by 0x50EDC1D: TNamed::~TNamed() (TNamed.h:41) ==7117== by 0x14535B0F: TF1::~TF1() (TF1.cxx:827) ==7117== by 0x1454CA07: TF2::~TF2() (TF2.cxx:153) ==7117== by 0x1454CA3D: TF2::~TF2() (TF2.cxx:155)
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Starting build on |
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I reverted the old change and applied my original one liner to fix the bug instead. Thanks for spotting the problem. |
This was referenced Sep 3, 2021
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…ove()"
This partially revert commit 71b778c
We can not use (directly) a for loop in RecursiveRemove as its deletes
the object/iterator inside the loop:
for (TObjLink *lnk = fFirst; lnk; lnk = lnk->Next()) {
...
DeleteLink(lnk);
}
Resulting in :
Processing tutorials/graphs/multipalette.C...
(TCanvas ) 0x12fd08e0
==7117== Invalid read of size 8
==7117== at 0x5111612: TObjLink::Next() (TList.h:142)
==7117== by 0x51B74F4: TList::RecursiveRemove(TObject) (TList.cxx:713)
==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143)
==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722)
==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143)
==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722)
==7117== by 0x51B96CB: THashList::RecursiveRemove(TObject*) (THashList.cxx:286)
==7117== by 0x514245A: TObject::~TObject() (TObject.cxx:88)
==7117== by 0x50EDC1D: TNamed::~TNamed() (TNamed.h:41)
==7117== by 0x14535B0F: TF1::~TF1() (TF1.cxx:827)
==7117== by 0x1454CA07: TF2::~TF2() (TF2.cxx:153)
==7117== by 0x1454CA3D: TF2::~TF2() (TF2.cxx:155)
==7117== by 0x51B09D4: TCollection::GarbageCollect(TObject*) (TCollection.cxx:748)
==7117== by 0x51B6BE8: TList::Delete(char const*) (TList.cxx:501)
==7117== by 0x518E05D: TROOT::EndOfProcessCleanups() (TROOT.cxx:1171)
==7117== by 0x524F659: TUnixSystem::Exit(int, bool) (TUnixSystem.cxx:2153)
==7117== by 0x5169BE1: TApplication::Terminate(int) (TApplication.cxx:1279)
==7117== by 0x4049925: TRint::Terminate(int) (TRint.cxx:686)
==7117== by 0x40486D5: TRint::Run(bool) (TRint.cxx:437)
==7117== by 0x4012AA: main (rmain.cxx:30)
==7117== Address 0x6e72ff8 is 8 bytes inside a block of size 56 free'd
==7117== at 0x4C2918D: operator delete(void*) (vg_replace_malloc.c:576)
==7117== by 0x51B8B11: TObjOptLink::~TObjOptLink() (TList.h:163)
==7117== by 0x51B6DAF: TList::DeleteLink(TObjLink*) (TList.cxx:530)
==7117== by 0x51B74C0: TList::RecursiveRemove(TObject*) (TList.cxx:742)
==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143)
==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722)
==7117== by 0x4164444: TPad::RecursiveRemove(TObject*) (TPad.cxx:5143)
==7117== by 0x51B73B7: TList::RecursiveRemove(TObject*) (TList.cxx:722)
==7117== by 0x51B96CB: THashList::RecursiveRemove(TObject*) (THashList.cxx:286)
==7117== by 0x514245A: TObject::~TObject() (TObject.cxx:88)
==7117== by 0x50EDC1D: TNamed::~TNamed() (TNamed.h:41)
==7117== by 0x14535B0F: TF1::~TF1() (TF1.cxx:827)
==7117== by 0x1454CA07: TF2::~TF2() (TF2.cxx:153)
==7117== by 0x1454CA3D: TF2::~TF2() (TF2.cxx:155)