[ELF] - Do not crash on invalid size of dynamic section.

Previously if sh_size of dynamic section was broken,
lld may crash. Or even may not crash if used 32 bits host.
(then value may be truncated to 32 bits when doing pointer arithmetic 
and could be just zero).
Patch fixes the issue.

Differential revision: https://reviews.llvm.org/D25327

llvm-svn: 283533

1 files changed, 4 insertions, 4 deletions

diff --git a/lld/ELF/InputFiles.cpp b/lld/ELF/InputFiles.cpp
index 5b0ce109789..dda18aa8a4c 100644
--- a/lld/ELF/InputFiles.cpp
+++ b/lld/ELF/InputFiles.cpp
@@ -523,11 +523,11 @@ template <class ELFT> void SharedFile<ELFT>::parseSoName() {
 
   if (!DynamicSec)
     return;
-  auto *Begin =
-      reinterpret_cast<const Elf_Dyn *>(Obj.base() + DynamicSec->sh_offset);
-  const Elf_Dyn *End = Begin + DynamicSec->sh_size / sizeof(Elf_Dyn);
 
-  for (const Elf_Dyn &Dyn : make_range(Begin, End)) {
+  ArrayRef<Elf_Dyn> Arr =
+      check(Obj.template getSectionContentsAsArray<Elf_Dyn>(DynamicSec),
+            getFilename(this) + ": getSectionContentsAsArray failed");
+  for (const Elf_Dyn &Dyn : Arr) {
     if (Dyn.d_tag == DT_SONAME) {
       uintX_t Val = Dyn.getVal();
       if (Val >= this->StringTable.size())