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[MachO] Fix UB in memcpy 

UBSan complains about a memcpy with a null pointer, so just skip the
memcpy call if the data is empty.
This commit is contained in:
Shoaib Meenai 2020-04-28 11:29:30 -07:00
parent 1b56980845
commit af40bff32d
1 changed files with 2 additions and 1 deletions
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3
lld/MachO/InputSection.cpp
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@ -26,7 +26,8 @@ uint64_t InputSection::getFileOffset() const {
}
void InputSection::writeTo(uint8_t *buf) {
memcpy(buf, data.data(), data.size());
if (!data.empty())
memcpy(buf, data.data(), data.size());
for (Reloc &r : relocs) {
uint64_t va = 0;