gcc/libstdc++-v3/include/bits
Jonathan Wakely 4d1c5b4957 libstdc++: Avoid overflow in istream::get(streambuf&) [LWG 3464]
Similar to the recent changes to basic_istream::ignore, this change
ensures that _M_gcount doesn't overflow when extracting characters and
inserting them into another streambuf.

The solution used here is to use unsigned long long for the count. We
assume that the number of characters extracted won't exceed the maximum
value for that type, but even if it does we avoid any undefined
behaviour.

libstdc++-v3/ChangeLog:

	* include/bits/istream.tcc
	(basic_istream::get(__streambuf_type&, char_type): Use unsigned
	long long for counter and check if it would overflow _M_gcount.
	* testsuite/27_io/basic_istream/get/char/lwg3464.cc: New test.
	* testsuite/27_io/basic_istream/get/wchar_t/lwg3464.cc: New test.
2020-07-20 20:06:46 +01:00
..
algorithmfwd.h Update copyright years. 2020-01-01 12:51:42 +01:00
alloc_traits.h libstdc++: Avoid errors in allocator's noexcept-specifier (PR 89510) 2020-04-30 16:01:43 +01:00
allocated_ptr.h Update copyright years. 2020-01-01 12:51:42 +01:00
allocator.h libstdc++: Avoid errors in allocator's noexcept-specifier (PR 89510) 2020-04-30 16:01:43 +01:00
atomic_base.h libstdc++: Strip cv-qualifiers in std::atomic<FP> (PR 95282) 2020-06-16 22:34:55 +01:00
atomic_futex.h Update copyright years. 2020-01-01 12:51:42 +01:00
basic_ios.h Update copyright years. 2020-01-01 12:51:42 +01:00
basic_ios.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
basic_string.h Revert "Add a __nonnnull__ attribute to std::string's _CharT* constructor" 2020-06-30 01:59:34 +03:00
basic_string.tcc libstdc++: Fix outdated comment about std::string instantiations (PR 94854) 2020-04-29 19:00:58 +01:00
boost_concept_check.h libstdc++: Make _GLIBCXX_CONCEPT_CHECKS more constexpr-friendly 2020-02-27 10:52:28 +00:00
c++0x_warning.h Update copyright years. 2020-01-01 12:51:42 +01:00
c++config libstdc++: Fix freestanding build PR 92376) 2020-01-17 17:03:46 +00:00
char_traits.h libstdc++: Update value of __cpp_lib_constexpr_char_traits for C++20 2020-06-15 14:31:26 +01:00
charconv.h Update copyright years. 2020-01-01 12:51:42 +01:00
codecvt.h Update copyright years. 2020-01-01 12:51:42 +01:00
concept_check.h Update copyright years. 2020-01-01 12:51:42 +01:00
cpp_type_traits.h libstdc++: Fix comment on __memcpyable 2020-03-04 15:35:20 +00:00
deque.tcc libstdc++: Extend memcmp optimization in std::lexicographical_compare 2020-06-10 17:48:56 +01:00
enable_special_members.h Update copyright years. 2020-01-01 12:51:42 +01:00
erase_if.h libstdc++: Update __cpp_lib_erase_if macro (P1115R3) 2020-02-15 10:25:23 +00:00
forward_list.h libstdc++: Add comparison operators to sequence containers 2020-04-17 23:41:04 +01:00
forward_list.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
fs_dir.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
fs_fwd.h libstdc++: Add comparison operators to std::filesystem types 2020-04-15 21:01:42 +01:00
fs_ops.h Update copyright years. 2020-01-01 12:51:42 +01:00
fs_path.h libstdc++: Fix filesystem::u8path for mingw targets (PR 95392) 2020-06-02 00:07:05 +01:00
fstream.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
functexcept.h Update copyright years. 2020-01-01 12:51:42 +01:00
functional_hash.h Update copyright years. 2020-01-01 12:51:42 +01:00
gslice_array.h Update copyright years. 2020-01-01 12:51:42 +01:00
gslice.h Update copyright years. 2020-01-01 12:51:42 +01:00
hashtable_policy.h libstdc++: Review unordered_map insert_or_assign/try_emplace (PR 95079) 2020-05-29 13:12:36 +02:00
hashtable.h libstdc++: Add missing std:: qualification of a forward call 2020-02-12 22:09:41 +01:00
indirect_array.h Update copyright years. 2020-01-01 12:51:42 +01:00
invoke.h Update copyright years. 2020-01-01 12:51:42 +01:00
ios_base.h Update copyright years. 2020-01-01 12:51:42 +01:00
istream.tcc libstdc++: Avoid overflow in istream::get(streambuf&) [LWG 3464] 2020-07-20 20:06:46 +01:00
iterator_concepts.h libstdc++: Remove workarounds for constrained nested class templates 2020-06-04 23:20:49 +01:00
list.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
locale_classes.h libstdc++: Add comparison operators to types from Utilities clause 2020-04-15 19:47:48 +01:00
locale_classes.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
locale_conv.h Update copyright years. 2020-01-01 12:51:42 +01:00
locale_facets_nonio.h Update copyright years. 2020-01-01 12:51:42 +01:00
locale_facets_nonio.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
locale_facets.h Update copyright years. 2020-01-01 12:51:42 +01:00
locale_facets.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
localefwd.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
mask_array.h Update copyright years. 2020-01-01 12:51:42 +01:00
memoryfwd.h Update copyright years. 2020-01-01 12:51:42 +01:00
move.h Update copyright years. 2020-01-01 12:51:42 +01:00
node_handle.h Update copyright years. 2020-01-01 12:51:42 +01:00
ostream_insert.h Update copyright years. 2020-01-01 12:51:42 +01:00
ostream.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
parse_numbers.h libstdc++: Replace __int_limits with __numeric_traits_integer 2020-07-07 23:36:29 +01:00
postypes.h Update copyright years. 2020-01-01 12:51:42 +01:00
predefined_ops.h Update copyright years. 2020-01-01 12:51:42 +01:00
ptr_traits.h libstdc++: Add missing feature test macros 2020-04-22 22:54:34 +01:00
quoted_string.h Update copyright years. 2020-01-01 12:51:42 +01:00
random.h libstdc++: Reduce header dependencies for C++20 (PR 92546) 2020-02-17 15:43:43 +00:00
random.tcc libstdc++: Fix undefined behaviour in random dist serialization (PR93205) 2020-01-09 16:50:51 +00:00
range_access.h libstdc++: Replace __int_limits with __numeric_traits_integer 2020-07-07 23:36:29 +01:00
range_cmp.h libstdc++: Define __cpp_lib_ranges macro for C++20 2020-03-27 23:26:03 +00:00
ranges_algo.h libstdc++: Fix some ranges algos optimizations [PR95578] 2020-06-10 17:37:53 -04:00
ranges_algobase.h libstdc++: Fix some ranges algos optimizations [PR95578] 2020-06-10 17:37:53 -04:00
ranges_uninitialized.h libstdc++: Move-only input iterator support in <memory> algorithms (LWG 3355) 2020-03-03 22:44:39 -05:00
refwrap.h libstdc++: Avoid using sizeof with function types (PR 93470) 2020-01-28 13:24:09 +00:00
regex_automaton.h Update copyright years. 2020-01-01 12:51:42 +01:00
regex_automaton.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
regex_compiler.h Update copyright years. 2020-01-01 12:51:42 +01:00
regex_compiler.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
regex_constants.h Update copyright years. 2020-01-01 12:51:42 +01:00
regex_error.h Update copyright years. 2020-01-01 12:51:42 +01:00
regex_executor.h Update copyright years. 2020-01-01 12:51:42 +01:00
regex_executor.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
regex_scanner.h Update copyright years. 2020-01-01 12:51:42 +01:00
regex_scanner.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
regex.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
regex.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
shared_ptr_atomic.h Update copyright years. 2020-01-01 12:51:42 +01:00
shared_ptr_base.h libstdc++: Add comparison operators to std::shared_ptr (PR 94562) 2020-04-14 21:54:55 +01:00
shared_ptr.h libstdc++: Add comparison operators to std::shared_ptr (PR 94562) 2020-04-14 21:54:55 +01:00
slice_array.h libstdc++: Add comparison operators to types from Numerics clause 2020-04-08 16:51:59 +01:00
specfun.h Update copyright years. 2020-01-01 12:51:42 +01:00
sstream.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
std_abs.h Update copyright years. 2020-01-01 12:51:42 +01:00
std_function.h libstdc++: Define all std::function members inline 2020-06-19 14:37:52 +01:00
std_mutex.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_algo.h libstdc++: std::includes performance tweak 2020-06-19 13:03:45 +01:00
stl_algobase.h libstdc++: Fix warnings with -Wsystem-headers 2020-06-24 12:34:17 +01:00
stl_bvector.h libstdc++ std::fill overload for std::vector<bool>::iterator 2020-05-06 23:28:22 +02:00
stl_construct.h libstdc++: Fix regression in std::_Construct (PR 94831) 2020-04-28 23:39:38 +01:00
stl_deque.h libstdc++: Add comparison operators to sequence containers 2020-04-17 23:41:04 +01:00
stl_function.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_heap.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_iterator_base_funcs.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_iterator_base_types.h libstdc++: Define __cpp_lib_ranges macro for C++20 2020-03-27 23:26:03 +00:00
stl_iterator.h libstdc++: Define converting assignment operator for std::move_iterator 2020-06-09 22:16:24 +01:00
stl_list.h libstdc++: Add comparison operators to sequence containers 2020-04-17 23:41:04 +01:00
stl_map.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
stl_multimap.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
stl_multiset.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
stl_numeric.h libstdc++: P1645R1 constexpr for <numeric> algorithms 2020-02-26 10:23:17 -05:00
stl_pair.h libstdc++: Remove redundant std:: qualification 2020-06-19 15:02:54 +01:00
stl_queue.h libstdc++: Define operator<=> for std::stack and std::queue 2020-04-19 21:30:15 +01:00
stl_raw_storage_iter.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_relops.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_set.h libstdc++: Fix -Wmismatched-tags warnings (PR 96063) 2020-07-06 17:12:29 +01:00
stl_stack.h libstdc++: Define operator<=> for std::stack and std::queue 2020-04-19 21:30:15 +01:00
stl_tempbuf.h Update copyright years. 2020-01-01 12:51:42 +01:00
stl_tree.h libstdc++: Fix [multi]map/[multi]set move constructors noexcept qualification 2020-07-08 08:02:16 +02:00
stl_uninitialized.h libstdc++: Fix some -Wsystem-headers warnings (PR 95765) 2020-06-19 18:20:05 +01:00
stl_vector.h libstdc++: Add comparison operators to sequence containers 2020-04-17 23:41:04 +01:00
stream_iterator.h libstdc++: Fix compilation with released versions of Clang 2020-03-18 12:55:29 +00:00
streambuf_iterator.h libstdc++: Specialize copy/copy_n for istreambuf_iterator and deque iterators 2020-06-04 22:27:47 +02:00
streambuf.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
string_view.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
stringfwd.h Update copyright years. 2020-01-01 12:51:42 +01:00
uniform_int_dist.h libstdc++: Reduce header dependencies for C++20 (PR 92546) 2020-02-17 15:43:43 +00:00
unique_lock.h Update copyright years. 2020-01-01 12:51:42 +01:00
unique_ptr.h libstdc++: Implement operator<< for std::unique_ptr (LWG 2948) 2020-06-08 21:21:31 +01:00
unordered_map.h libstdc++: Review unordered_map insert_or_assign/try_emplace (PR 95079) 2020-05-29 13:12:36 +02:00
unordered_set.h libstdc++: Remove operator!= overloads for unordered containers 2020-04-19 21:05:32 +01:00
uses_allocator.h Update copyright years. 2020-01-01 12:51:42 +01:00
valarray_after.h Update copyright years. 2020-01-01 12:51:42 +01:00
valarray_array.h Update copyright years. 2020-01-01 12:51:42 +01:00
valarray_array.tcc Update copyright years. 2020-01-01 12:51:42 +01:00
valarray_before.h Update copyright years. 2020-01-01 12:51:42 +01:00
vector.tcc Update copyright years. 2020-01-01 12:51:42 +01:00