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ensure no NULL is passed to memcpy

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NULL is valid when size is 0, but memcpy uses nonnull attributes,
so let's not poke the bear
This commit is contained in:
moneromooo-monero 2019-04-29 08:17:32 +00:00
parent bc09766bf9
commit 0564da5fdc
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GPG key ID: 686F07454D6CEFC3
4 changed files with 18 additions and 9 deletions
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3
contrib/epee/src/buffer.cpp
View file

@ -64,7 +64,8 @@ void buffer::append(const void *data, size_t sz)
size_t reserve = (((size() + sz) * 3 / 2) + 4095) & ~4095;
new_storage.reserve(reserve);
new_storage.resize(size());
memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
if (size() > 0)
memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
offset = 0;
std::swap(storage, new_storage);
}

17
contrib/epee/src/wipeable_string.cpp
View file

@ -62,13 +62,15 @@ wipeable_string::wipeable_string(wipeable_string &&other)
wipeable_string::wipeable_string(const std::string &other)
{
grow(other.size());
memcpy(buffer.data(), other.c_str(), size());
if (size() > 0)
memcpy(buffer.data(), other.c_str(), size());
}
wipeable_string::wipeable_string(std::string &&other)
{
grow(other.size());
memcpy(buffer.data(), other.c_str(), size());
if (size() > 0)
memcpy(buffer.data(), other.c_str(), size());
if (!other.empty())
{
memwipe(&other[0], other.size()); // we're kinda left with this again aren't we
@ -79,7 +81,8 @@ wipeable_string::wipeable_string(std::string &&other)
wipeable_string::wipeable_string(const char *s)
{
grow(strlen(s));
memcpy(buffer.data(), s, size());
if (size() > 0)
memcpy(buffer.data(), s, size());
}
wipeable_string::wipeable_string(const char *s, size_t len)
@ -112,14 +115,18 @@ void wipeable_string::grow(size_t sz, size_t reserved)
}
size_t old_sz = buffer.size();
std::unique_ptr<char[]> tmp{new char[old_sz]};
memcpy(tmp.get(), buffer.data(), old_sz * sizeof(char));
if (old_sz > 0)
{
memcpy(tmp.get(), buffer.data(), old_sz * sizeof(char));
memwipe(buffer.data(), old_sz * sizeof(char));
}
buffer.reserve(reserved);
buffer.resize(sz);
memcpy(buffer.data(), tmp.get(), old_sz * sizeof(char));
if (old_sz > 0)
{
memcpy(buffer.data(), tmp.get(), old_sz * sizeof(char));
memwipe(tmp.get(), old_sz * sizeof(char));
}
}
void wipeable_string::push_back(char c)