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DescriptionPavla Kratochvilova
2020-02-19 09:57:35 UTC
+++ This bug was initially created as a clone of Bug #1803038 +++
Description of problem:
DNF crashes with an UTF-8 char in the repository filename
Version-Release number of selected component (if applicable):
libdnf-0.35.1-9.el8_1.x86_64
dnf-4.2.7-7.el8_1.noarch
How reproducible:
100%
Steps to Reproduce:
1. touch '/etc/yum.repos.d/team'$'\303''_epel.repo'
2. dnf repolist
Actual results:
# dnf repolist
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Segmentation fault (core dumped)
Expected results:
No crash.
Additional info:
This looks similar to another bug, but this commit has already been backported:
https://github.com/rpm-software-management/libdnf/commit/97c23dfff803ef30b4d25a224218da1442a49220
I will attach the corresponding coredump.
(gdb) bt
#0 0x00007f45515415aa in PyBytes_AsStringAndSize (obj=<optimized out>, s=<optimized out>, len=<optimized out>, obj=<optimized out>, s=<optimized out>, len=<optimized out>)
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Objects/bytesobject.c:1296
#1 0x00007f454398b921 in SWIG_AsCharPtrAndSize (obj=0x0, obj@entry='/etc/yum.repos.d/team\udcc3_epel.repo', cptr=cptr@entry=0x7ffc6ee86290, psize=psize@entry=0x7ffc6ee86298,
alloc=alloc@entry=0x7ffc6ee8628c) at /usr/src/debug/libdnf-0.35.1-9.el8_1.x86_64/build-py3/bindings/python/confPYTHON_wrap.cxx:4821
#2 0x00007f454399913a in SWIG_AsPtr_std_string(PyObject*, std::(char, long long, long long, ::string**)) (obj='/etc/yum.repos.d/team\udcc3_epel.repo', val=0x7ffc6ee862f0)
at /usr/src/debug/libdnf-0.35.1-9.el8_1.x86_64/build-py3/bindings/python/confPYTHON_wrap.cxx:4912
#3 0x00007f454399acd9 in _wrap_ConfigParser_read (args=<optimized out>) at /usr/src/debug/libdnf-0.35.1-9.el8_1.x86_64/build-py3/bindings/python/confPYTHON_wrap.cxx:26409
#4 0x00007f45515a7832 in _PyCFunction_FastCallDict (func_obj=<built-in method ConfigParser_read of module object at remote 0x7f4543c2d5e8>, args=0x7f453dc04a98, nargs=<optimized out>,
kwargs=0x0) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Objects/methodobject.c:234
#5 0x00007f45515a7d6d in call_function (pp_stack=0x7ffc6ee86458, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4851
#6 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#7 0x00007f455157361a in _PyFunction_FastCall (globals=<optimized out>, nargs=2, args=<optimized out>, co=<optimized out>)
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#8 fast_function (func=<optimized out>, stack=0x55742f024700, nargs=2, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#9 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee86608, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#10 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#11 0x00007f455157361a in _PyFunction_FastCall (globals=<optimized out>, nargs=2, args=<optimized out>, co=<optimized out>)
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#12 fast_function (func=<optimized out>, stack=0x55742f375280, nargs=2, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#13 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee867b8, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#14 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#15 0x00007f45515a8e8f in gen_send_ex (closing=0, exc=<optimized out>, arg=0x0, gen=0x7f453af40a98) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Objects/genobject.c:563
#16 gen_iternext (gen=0x7f453af40a98) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Objects/genobject.c:563
#17 0x00007f45515e73e6 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3111
#18 0x00007f45515a8e0f in gen_send_ex (closing=0, exc=<optimized out>, arg=0x0, gen=0x7f453af40b48) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Objects/genobject.c:563
#19 gen_iternext (gen=0x7f453af40b48) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Objects/genobject.c:563
#20 0x00007f45515e73e6 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3111
#21 0x00007f45515397db in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=0x0,
kwargs=0x55742f2b90f0, kwcount=<optimized out>, kwstep=1, defs=0x7f454df4d5d8, defcount=1, kwdefs=0x0, closure=0x0, name='read_all_repos', qualname='Base.read_all_repos')
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4166
#22 0x00007f45515737d0 in fast_function (func=<optimized out>, stack=0x55742f2b90e0, nargs=2, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4992
#23 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee86d78, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#24 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#25 0x00007f455157361a in _PyFunction_FastCall (globals=<optimized out>, nargs=2, args=<optimized out>, co=<optimized out>)
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#26 fast_function (func=<optimized out>, stack=0x55742eec8768, nargs=2, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#27 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee86f28, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#28 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#29 0x00007f45515397db in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=0x0,
kwargs=0x55742f052b98, kwcount=<optimized out>, kwstep=1, defs=0x7f453e340f40, defcount=1, kwdefs=0x0, closure=0x0, name='configure', qualname='Cli.configure')
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4166
#30 0x00007f45515737d0 in fast_function (func=<optimized out>, stack=0x55742f052b80, nargs=3, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4992
#31 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee87208, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#32 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#33 0x00007f455157361a in _PyFunction_FastCall (globals=<optimized out>, nargs=4, args=<optimized out>, co=<optimized out>)
at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
#34 fast_function (func=<optimized out>, stack=0x55742f00ba20, nargs=4, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4968
--Type <RET> for more, q to quit, c to continue without paging--c
#35 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee873b8, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#36 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#37 0x00007f45515397db in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=0x0, kwargs=0x55742f004318, kwcount=<optimized out>, kwstep=1, defs=0x7f453dbf08d0, defcount=3, kwdefs=0x0, closure=0x0, name='main', qualname='main') at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4166
#38 0x00007f45515737d0 in fast_function (func=<optimized out>, stack=0x55742f004310, nargs=1, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4992
#39 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee87698, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#40 0x00007f45515e6faa in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3335
#41 0x00007f45515397db in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kwnames=0x7f45504491e8, kwargs=0x55742ec2e0f0, kwcount=<optimized out>, kwstep=1, defs=0x7f453dbf4728, defcount=1, kwdefs=0x0, closure=0x0, name='user_main', qualname='user_main') at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4166
#42 0x00007f45515737d0 in fast_function (func=<optimized out>, stack=0x55742ec2e0e8, nargs=1, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4992
#43 0x00007f45515a7e52 in call_function (pp_stack=0x7ffc6ee87980, oparg=<optimized out>, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4872
#44 0x00007f45515e7f14 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3351
#45 0x00007f45515c10c8 in _PyEval_EvalCodeWithName (qualname=0x0, name=<optimized out>, closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwstep=2, kwcount=<optimized out>, kwargs=<optimized out>, kwnames=<optimized out>, argcount=<optimized out>, args=<optimized out>, locals=<optimized out>, globals=<optimized out>, _co=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:3902
#46 PyEval_EvalCodeEx (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:4187
#47 0x00007f45515c1f7b in PyEval_EvalCode (co=co@entry=<code at remote 0x7f4551a42540>, globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/usr/bin/dnf') at remote 0x7f4551a80898>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f4551b48638>, '__file__': '/usr/bin/dnf', '__cached__': None, 'unicode_literals': <_Feature(optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0), compiler_flag=131072) at remote 0x7f45503dfdd8>, 'sys': <module at remote 0x7f4551ad4ef8>, 'suppress_keyboard_interrupt_message': <function at remote 0x7f4551ab1e18>, 'here': '/usr/bin', 'main': <module at remote 0x7f453e32f458>}, locals=locals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/usr/bin/dnf') at remote 0x7f4551a80898>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f4551b48638>, '__file__': '/usr/bin/dnf', '__cached__': None, 'unicode_literals': <_Feature(optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0), compiler_flag=131072) at remote 0x7f45503dfdd8>, 'sys': <module at remote 0x7f4551ad4ef8>, 'suppress_keyboard_interrupt_message': <function at remote 0x7f4551ab1e18>, 'here': '/usr/bin', 'main': <module at remote 0x7f453e32f458>}) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/ceval.c:731
#48 0x00007f4551654282 in run_mod (mod=<optimized out>, filename=<optimized out>, globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/usr/bin/dnf') at remote 0x7f4551a80898>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f4551b48638>, '__file__': '/usr/bin/dnf', '__cached__': None, 'unicode_literals': <_Feature(optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0), compiler_flag=131072) at remote 0x7f45503dfdd8>, 'sys': <module at remote 0x7f4551ad4ef8>, 'suppress_keyboard_interrupt_message': <function at remote 0x7f4551ab1e18>, 'here': '/usr/bin', 'main': <module at remote 0x7f453e32f458>}, locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/usr/bin/dnf') at remote 0x7f4551a80898>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f4551b48638>, '__file__': '/usr/bin/dnf', '__cached__': None, 'unicode_literals': <_Feature(optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0), compiler_flag=131072) at remote 0x7f45503dfdd8>, 'sys': <module at remote 0x7f4551ad4ef8>, 'suppress_keyboard_interrupt_message': <function at remote 0x7f4551ab1e18>, 'here': '/usr/bin', 'main': <module at remote 0x7f453e32f458>}, flags=<optimized out>, arena=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/pythonrun.c:1025
#49 0x00007f4551655477 in PyRun_FileExFlags (fp=0x55742ec21840, filename_str=<optimized out>, start=<optimized out>, globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/usr/bin/dnf') at remote 0x7f4551a80898>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f4551b48638>, '__file__': '/usr/bin/dnf', '__cached__': None, 'unicode_literals': <_Feature(optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0), compiler_flag=131072) at remote 0x7f45503dfdd8>, 'sys': <module at remote 0x7f4551ad4ef8>, 'suppress_keyboard_interrupt_message': <function at remote 0x7f4551ab1e18>, 'here': '/usr/bin', 'main': <module at remote 0x7f453e32f458>}, locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/usr/bin/dnf') at remote 0x7f4551a80898>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f4551b48638>, '__file__': '/usr/bin/dnf', '__cached__': None, 'unicode_literals': <_Feature(optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0), compiler_flag=131072) at remote 0x7f45503dfdd8>, 'sys': <module at remote 0x7f4551ad4ef8>, 'suppress_keyboard_interrupt_message': <function at remote 0x7f4551ab1e18>, 'here': '/usr/bin', 'main': <module at remote 0x7f453e32f458>}, closeit=1, flags=0x7ffc6ee87c3c) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/pythonrun.c:978
#50 0x00007f4551656f7f in PyRun_SimpleFileExFlags (fp=0x55742ec21840, filename=<optimized out>, closeit=1, flags=0x7ffc6ee87c3c) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Python/pythonrun.c:419
#51 0x00007f455165807b in run_file (p_cf=0x7ffc6ee87c3c, filename=<optimized out>, fp=0x55742ec21840) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Modules/main.c:344
#52 Py_Main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Modules/main.c:814
#53 0x000055742cce0c68 in main (argc=3, argv=0x7ffc6ee87e48) at /usr/src/debug/python3-3.6.8-15.1.el8.x86_64/Programs/python.c:102
(gdb) f 1
#1 0x00007f454398b921 in SWIG_AsCharPtrAndSize (obj=0x0, obj@entry='/etc/yum.repos.d/team\udcc3_epel.repo', cptr=cptr@entry=0x7ffc6ee86290, psize=psize@entry=0x7ffc6ee86298,
alloc=alloc@entry=0x7ffc6ee8628c) at /usr/src/debug/libdnf-0.35.1-9.el8_1.x86_64/build-py3/bindings/python/confPYTHON_wrap.cxx:4821
4821 PyBytes_AsStringAndSize(obj, &cstr, &len);
(gdb) p *cstr
$1 = 72 'H'
(gdb) p *obj
Cannot access memory at address 0x0
--- Additional comment from marek77 on 2020-02-14 13:25:19 UTC ---
The segfault still happens on Fedora 30, but is fixed on Fedora 31:
$ cat /etc/redhat-release
Fedora release 30 (Thirty)
$ sudo touch '/etc/yum.repos.d/team'$'\303''_epel.repo'
$ sudo dnf repolist
Segmentation fault (core dumped)
$ rpm -q dnf libdnf
dnf-4.2.11-2.fc30.noarch
libdnf-0.35.5-5.fc30.x86_64
=======================================================================
$ cat /etc/redhat-release
Fedora release 31 (Thirty One)
$ sudo touch '/etc/yum.repos.d/team'$'\303''_epel.repo'
$ sudo dnf repolist
Warning: failed loading '/etc/yum.repos.d/team\udcc3_epel.repo', skipping.
<WORKS OK :) >
$ rpm -q dnf libdnf
dnf-4.2.18-1.fc31.noarch
libdnf-0.43.1-2.fc31.x86_64
--- Additional comment from Pavla Kratochvilova on 2020-02-19 09:55:54 UTC ---
The segfault is not dependent on the version of libdnf/dnf, but rather on the version of swig that is used for libdnf build. When I build the latest version of libdnf on Fedora 30 (with swig-3.0.12-26.fc30.x86_64), dnf segfaults, whereas when I build the latest version of libdnf on Fedora 31 (with swig-4.0.1-3.fc31), dnf doesn't segfault.
I will clone this bug for swig with more details.
Comment 1Pavla Kratochvilova
2020-02-19 09:59:44 UTC
I belive this bug is fixed in upstream swig because of the following key change in files that were automatically generated by swig:
Version 3.0.12:
#if !defined(SWIG_PYTHON_STRICT_BYTE_CHAR)
if (!alloc && cptr) {
/* We can't allow converting without allocation, since the internal
representation of string in Python 3 is UCS-2/UCS-4 but we require
a UTF-8 representation.
TODO(bhy) More detailed explanation */
return SWIG_RuntimeError;
}
obj = PyUnicode_AsUTF8String(obj); // Note: This returns NULL if there is an exception raised by codec
if(alloc) *alloc = SWIG_NEWOBJ;
#endif
PyBytes_AsStringAndSize(obj, &cstr, &len); // Note: This crashes if obj is NULL
Version 4.0.1:
#if !defined(SWIG_PYTHON_STRICT_BYTE_CHAR)
if (!alloc && cptr) {
/* We can't allow converting without allocation, since the internal
representation of string in Python 3 is UCS-2/UCS-4 but we require
a UTF-8 representation.
TODO(bhy) More detailed explanation */
return SWIG_RuntimeError;
}
obj = PyUnicode_AsUTF8String(obj);
if (!obj)
return SWIG_TypeError; // Note: This fixes the bug.
if (alloc)
*alloc = SWIG_NEWOBJ;
#endif
PyBytes_AsStringAndSize(obj, &cstr, &len);
Similar check after the PyUnicode_AsUTF8String call is on multiple places.
Please let me know what additional information you need.
Thank you for the report and your analysis.
It was probably fixed by upstream with the commit
commit b0e29fbdf31bb94b11cb8a7cc830b4a76467afa3
Author: William S Fulton <wsf.uk>
Date: Mon Dec 4 18:41:55 2017 +0000
Add missing checks for failures in calls to PyUnicode_AsUTF8String.
Previously a seg fault could occur when passing invalid UTF8 strings (low
surrogates), eg passing u"\udcff" to the C layer (Python 3).
https://github.com/swig/swig/commit/b0e29fbdf31bb94b11cb8a7cc830b4a76467afa3#diff-ba23eb3671d250e6a62261f19f653dd2
It is easy to backport.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (swig:3.0 bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:4633