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[Object, ELF] Fix segmentation fault in ELFFile::getSectionName().

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Don't do a null dereference if .shstrtab section is missing.

llvm-svn: 239124
This commit is contained in:
Alexey Samsonov 2015-06-04 23:40:23 +00:00
parent 0d416a532a
commit 0a55c45eea
3 changed files with 4 additions and 1 deletions
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2
include/llvm/Object/ELF.h
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@ -928,7 +928,7 @@ ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(const Elf_Shdr *Section,
template <class ELFT>
ErrorOr<StringRef>
ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
if (Section->sh_name >= dot_shstrtab_sec->sh_size)
if (!dot_shstrtab_sec || Section->sh_name >= dot_shstrtab_sec->sh_size)
return object_error::parse_failed;
return StringRef(getString(dot_shstrtab_sec, Section->sh_name));
}

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test/DebugInfo/Inputs/invalid.elf.no-shstrtab Normal file
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3
test/DebugInfo/dwarfdump-invalid.test
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@ -4,3 +4,6 @@ RUN: llvm-dwarfdump %p/Inputs/invalid.elf 2>&1 | FileCheck %s --check-prefix=INV
RUN: llvm-dwarfdump %p/Inputs/invalid.elf.2 2>&1 | FileCheck %s --check-prefix=INVALID-ELF
RUN: llvm-dwarfdump %p/Inputs/invalid.elf.3 2>&1 | FileCheck %s --check-prefix=INVALID-ELF
INVALID-ELF: Invalid data was encountered while parsing the file
RUN: llvm-dwarfdump %p/Inputs/invalid.elf.no-shstrtab 2>&1 | FileCheck %s --check-prefix=EMPTY
EMPTY: .debug_info contents: