d4cd871d15
This prevents a std::filesystem::path from exceeding INT_MAX/4 components (which is unlikely to ever be a problem except on 16-bit targets). That limit ensures that the capacity*1.5 calculation doesn't overflow. We should also check that we don't exceed SIZE_MAX when calculating how many bytes to allocate. That only needs to be checked when int is at least as large as size_t, because otherwise we know that the product INT_MAX/4 * sizeof(value_type) will fit in SIZE_MAX. For targets where size_t is twice as wide as int this obviously holds. For msp430-elf we have 16-bit int and 20-bit size_t, so the condition holds as long as sizeof(value_type) fits in 7 bits, which it does. We can also remove some floating-point arithmetic in operator/= which ensures exponential growth of the buffer. That's redundant because path::_List::reserve does that anyway (and does so more efficiently since the commit immediately before this one). libstdc++-v3/ChangeLog: * src/c++17/fs_path.cc (path::_List::reserve): Limit maximum size and check for overflows in arithmetic. (path::operator/=(const path&)): Remove redundant exponential growth calculation. |
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