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[tmodes <2025035@xxxxxxxxxxxxxxxxxx>]

** Changed in: hugin
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2025035

Title:
  Use-After-Free bug in HuginBase::ImageVariable<double>::linkWith

Status in Hugin:
  Fix Released

Bug description:
  Hi there

  We want to share that the latest version (2022.0.0) of pto_merge
  causes heap-use-after-free.

  We assume that the function HuginBase::BaseSrcPanoImage::setFilename
  in the function HuginBase::PanoramaMemento::loadPTScript tries to
  access previously freed memory.

  Here is the output of program with address sanitizer attached.

  ### Bug Report
  =================================================================
  ==3836==ERROR: AddressSanitizer: heap-use-after-free on address 0x606000001960 at pc 0x7fee211f5506 bp 0x7ffd73f55460 sp 0x7ffd73f55450
  READ of size 8 at 0x606000001960 thread T0
      #0 0x7fee211f5505 in HuginBase::PanoramaMemento::loadPTScript(std::istream&, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/image_variables.h:79
      #1 0x7fee211fc618 in HuginBase::Panorama::readData(std::istream&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/Panorama.cpp:2178
      #2 0x560fdf074975 in main /home/ubuntu/targets/hugin-2022.0.0_original/src/tools/pto_merge.cpp:99
      #3 0x7fee1e8f0082 in __libc_start_main ../csu/libc-start.c:308
      #4 0x560fdf075c5d in _start (/home/ubuntu/targets/hugin-2022.0.0_original/build/src/tools/pto_merge+0xbc5d)

  0x606000001960 is located 32 bytes inside of 57-byte region [0x606000001940,0x606000001979)
  freed by thread T0 here:
      #0 0x7fee2169b51f in operator delete(void*) ../../../../src/libsanitizer/asan/asan_new_delete.cc:165
      #1 0x7fee211c97aa in __gnu_cxx::new_allocator<char>::deallocate(char*, unsigned long) /usr/include/c++/9/ext/new_allocator.h:128
      #2 0x7fee211c97aa in std::allocator_traits<std::allocator<char> >::deallocate(std::allocator<char>&, char*, unsigned long) /usr/include/c++/9/bits/alloc_traits.h:469
      #3 0x7fee211c97aa in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_destroy(unsigned long) /usr/include/c++/9/bits/basic_string.h:241
      #4 0x7fee211c97aa in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_dispose() /usr/include/c++/9/bits/basic_string.h:236
      #5 0x7fee211c97aa in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string() /usr/include/c++/9/bits/basic_string.h:662
      #6 0x7fee211c97aa in HuginBase::BaseSrcPanoImage::setFilename(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/image_variables.h:62
      #7 0x7fee211c97aa in HuginBase::PanoramaMemento::loadPTScript(std::istream&, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/Panorama.cpp:3133
      #8 0x7fee211fc618 in HuginBase::Panorama::readData(std::istream&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/Panorama.cpp:2178
      #9 0x560fdf074975 in main /home/ubuntu/targets/hugin-2022.0.0_original/src/tools/pto_merge.cpp:99
      #10 0x7fee1e8f0082 in __libc_start_main ../csu/libc-start.c:308

  previously allocated by thread T0 here:
      #0 0x7fee2169a587 in operator new(unsigned long) ../../../../src/libsanitizer/asan/asan_new_delete.cc:104
      #1 0x560fdf07f9b8 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*, std::forward_iterator_tag) /usr/include/c++/9/bits/basic_string.tcc:219
      #2 0x7fee211c9736 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct_aux<char*>(char*, char*, std::__false_type) /usr/include/c++/9/bits/basic_string.h:251
      #3 0x7fee211c9736 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*) /usr/include/c++/9/bits/basic_string.h:270
      #4 0x7fee211c9736 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /usr/include/c++/9/bits/basic_string.h:455
      #5 0x7fee211c9736 in HuginBase::BaseSrcPanoImage::setFilename(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/image_variables.h:62
      #6 0x7fee211c9736 in HuginBase::PanoramaMemento::loadPTScript(std::istream&, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/Panorama.cpp:3133
      #7 0x7fee211fc618 in HuginBase::Panorama::readData(std::istream&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/Panorama.cpp:2178
      #8 0x560fdf074975 in main /home/ubuntu/targets/hugin-2022.0.0_original/src/tools/pto_merge.cpp:99
      #9 0x7fee1e8f0082 in __libc_start_main ../csu/libc-start.c:308

  SUMMARY: AddressSanitizer: heap-use-after-free /home/ubuntu/targets/hugin-2022.0.0_original/src/hugin_base/panodata/image_variables.h:79 in HuginBase::PanoramaMemento::loadPTScript(std::istream&, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
  Shadow bytes around the buggy address:
    0x0c0c7fff82d0: fa fa fa fa fd fd fd fd fd fd fd fd fa fa fa fa
    0x0c0c7fff82e0: fd fd fd fd fd fd fd fd fa fa fa fa fd fd fd fd
    0x0c0c7fff82f0: fd fd fd fd fa fa fa fa fd fd fd fd fd fd fd fd
    0x0c0c7fff8300: fa fa fa fa fd fd fd fd fd fd fd fd fa fa fa fa
    0x0c0c7fff8310: 00 00 00 00 00 00 00 00 fa fa fa fa fd fd fd fd
  =>0x0c0c7fff8320: fd fd fd fd fa fa fa fa fd fd fd fd[fd]fd fd fd
    0x0c0c7fff8330: fa fa fa fa 00 00 00 00 00 00 00 01 fa fa fa fa
    0x0c0c7fff8340: fd fd fd fd fd fd fd fd fa fa fa fa fd fd fd fd
    0x0c0c7fff8350: fd fd fd fd fa fa fa fa fd fd fd fd fd fd fd fd
    0x0c0c7fff8360: fa fa fa fa fd fd fd fd fd fd fd fd fa fa fa fa
    0x0c0c7fff8370: 00 00 00 00 00 00 00 01 fa fa fa fa fd fd fd fd
  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
    Shadow gap: cc
  ==3836==ABORTING

  ### Envionment
  OS: Ubuntu 20.04.5 LTS x86_64
  Release: hugin 2022.0.0
  Program: pto_merge
  libhuginbase: 2020.0.0 (retrieved and compiled from source code)
  libpano13: 2.9.19
  To reproduce the problem, we need to build hugin:
  sudo cmake -DCMAKE_C_FLAGS="-g" -DCMAKE_CXX_FLAGS="-g" ..

  ### How to reproduce
  $ pto_merge poc-file *.jpg
  (*.jpg any name of jpg file including asterisk(*))
  poc-file is attached.

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