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gcc/libstdc++-v3/include
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Jonathan Wakely 74270a546c libstdc++: Fix null pointer dereferences in __gnu_cxx::rope 
This fixes UBsan errors like:

/usr/include/c++/10/ext/ropeimpl.h:593:9: runtime error: member access within null pointer of type 'struct _RopeRep'
/usr/include/c++/10/ext/ropeimpl.h:593:9: runtime error: member call on null pointer of type 'struct _Rope_rep_base'
/usr/include/c++/10/ext/rope:556:17: runtime error: reference binding to null pointer of type 'struct allocator_type'
/usr/include/c++/10/ext/ropeimpl.h:593:9: runtime error: reference binding to null pointer of type 'struct allocator_type'
/usr/include/c++/10/ext/rope:1700:30: runtime error: member call on null pointer of type 'struct new_allocator'
/usr/include/c++/10/ext/new_allocator.h:105:29: runtime error: member call on null pointer of type 'struct new_allocator'
/usr/include/c++/10/ext/rope:1702:26: runtime error: reference binding to null pointer of type 'const struct allocator'
/usr/include/c++/10/bits/allocator.h:148:34: runtime error: reference binding to null pointer of type 'const struct new_allocator'
/usr/include/c++/10/ext/rope:1664:39: runtime error: reference binding to null pointer of type 'const struct allocator'
/usr/include/c++/10/ext/rope:1665:9: runtime error: reference binding to null pointer of type 'const struct allocator_type'
/usr/include/c++/10/ext/rope:725:36: runtime error: reference binding to null pointer of type 'const struct allocator_type'
/usr/include/c++/10/ext/rope:614:64: runtime error: reference binding to null pointer of type 'const struct allocator_type'

The problem is calling r->_M_get_allocator() when r is null.

libstdc++-v3/ChangeLog:

	* include/ext/rope (rope::_S_concat_char_iter)
	(rope::_S_destr_concat_char_iter): Add allocator parameter.
	(rope::push_back, rope::append, rope::insert, operator+):
	Pass allocator.
	* include/ext/ropeimpl.h (rope::_S_concat_char_iter)
	(rope::_S_destr_concat_char_iter): Add allocator parameter
	and use it.
	(_Rope_char_ref_proxy::operator=(_CharT)): Pass allocator.
2020-12-02 12:29:00 +00:00
..
backward libstdc++: Add deprecated attributes to old iostream members 2020-08-19 12:13:23 +01:00
bits libstdc++: Make preprocessor checks for __cpp_lib_atomic_wait consistent 2020-12-02 00:39:22 +00:00
c
c_compatibility
c_global libstdc++: Add parentheses around assignments used as truth values 2020-09-10 17:09:16 +01:00
c_std
debug libstdc++: Remove <debug/array> 2020-11-09 21:20:01 +01:00
decimal
experimental libstdc++: Remove <debug/array> 2020-11-09 21:20:01 +01:00
ext libstdc++: Fix null pointer dereferences in __gnu_cxx::rope 2020-12-02 12:29:00 +00:00
parallel libstdc++: Define new C++17 std::search overload for Parallel Mode [PR 94971] 2020-11-04 13:36:32 +00:00
precompiled libstdc++: Add new headers to stdc++.h 2020-11-26 11:25:55 +00:00
pstl libstdc++: Rebase include/pstl to current upstream 2020-10-21 06:11:28 -07:00
std libstdc++: Make preprocessor checks for __cpp_lib_atomic_wait consistent 2020-12-02 00:39:22 +00:00
tr1 libstdc++: Prevent deprecation warnings from <tr1/shared_ptr> 2020-10-29 22:47:22 +00:00
tr2
Makefile.am libstdc++: Add C++2a synchronization support 2020-11-20 14:40:18 -08:00
Makefile.in libstdc++: Add C++2a synchronization support 2020-11-20 14:40:18 -08:00