[Object, ELF] Don't assert on invalid magic in createELFObjectFile.

Instead, return a proper error code from factory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239116 91177308-0d34-0410-b5e6-96231b3b80d8

Author: vonosmas

lib/Object/ELFObjectFile.cpp

@@ -39,14 +39,15 @@ ObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
       R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC));
     else
       return object_error::parse_failed;
-  } else {
-    assert(Ident.first == ELF::ELFCLASS64);
+  } else if (Ident.first == ELF::ELFCLASS64) {
     if (Ident.second == ELF::ELFDATA2LSB)
       R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC));
     else if (Ident.second == ELF::ELFDATA2MSB)
       R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC));
     else
       return object_error::parse_failed;
+  } else {
+    return object_error::parse_failed;
   }
 
   if (EC)

test/DebugInfo/Inputs/invalid.elf.3

@@ -0,0 +1 @@
+ELF�L�'ELF



B

test/DebugInfo/dwarfdump-invalid.test

@@ -2,4 +2,5 @@
 
 RUN: llvm-dwarfdump %p/Inputs/invalid.elf 2>&1 | FileCheck %s --check-prefix=INVALID-ELF
 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