[llvm] [llvm-objdump][ELF]Fix crash when reading strings from .dynstr (PR #125679)

[Ruoyu Qiu via llvm-commits]

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@@ -221,6 +221,28 @@ template <class ELFT> void ELFDumper<ELFT>::printDynamicSection() {
   std::string TagFmt = "  %-" + std::to_string(MaxLen) + "s ";
 
   outs() << "\nDynamic Section:\n";
+  typename ELFT::Xword StringTableSize{0};
+  for (const typename ELFT::Shdr &Sec : cantFail(Elf.sections())) {
+    if (Sec.sh_type == ELF::SHT_DYNSYM) {
+      Expected<const typename ELFT::Shdr *> StringTableSecOrError =
+          getSection<ELFT>(cantFail(Elf.sections()), Sec.sh_link);
+      if (!StringTableSecOrError) {
+        consumeError(StringTableSecOrError.takeError());
+        break;
+      }
+      StringTableSize = StringTableSize < (*StringTableSecOrError)->sh_size
+                            ? (*StringTableSecOrError)->sh_size
+                            : StringTableSize;
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cabbaken wrote:

Yes, I will fix it.

https://github.com/llvm/llvm-project/pull/125679