commit 327f5f9ccd21e0a08b9957172f9f63cb0ee31e1b
author Fangrui Song <maskray@google.com> Thu Oct 17 11:21:54 2019 +0000
committer Fangrui Song <maskray@google.com> Thu Oct 17 11:21:54 2019 +0000
tree 09593fcf9ae19fc7749633a034ae8369f3989139
parent 8c62cab5538f46719bfef9e485009853af83b282

[llvm-objcopy] --add-symbol: fix crash if SHT_SYMTAB does not exist

Exposed by D69041. If SHT_SYMTAB does not exist, ELFObjcopy.cpp:handleArgs will crash due
to a null pointer dereference.

  for (const NewSymbolInfo &SI : Config.ELF->SymbolsToAdd) {
    ...
    Obj.SymbolTable->addSymbol(

Fix this by creating .symtab and .strtab on demand in ELFBuilder<ELFT>::readSections,
if --add-symbol is specified.

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D69093

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375105 91177308-0d34-0410-b5e6-96231b3b80d8