From 0564da5fdc165948ba7c862fb81478f9287a072d Mon Sep 17 00:00:00 2001 From: moneromooo-monero Date: Mon, 29 Apr 2019 08:17:32 +0000 Subject: ensure no NULL is passed to memcpy NULL is valid when size is 0, but memcpy uses nonnull attributes, so let's not poke the bear --- contrib/epee/src/wipeable_string.cpp | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) (limited to 'contrib/epee/src/wipeable_string.cpp') diff --git a/contrib/epee/src/wipeable_string.cpp b/contrib/epee/src/wipeable_string.cpp index 3a6ee5dac..4209b71bf 100644 --- a/contrib/epee/src/wipeable_string.cpp +++ b/contrib/epee/src/wipeable_string.cpp @@ -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 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) -- cgit v1.2.3