From d16bbc5340a4d16f8b63b265f46d9a5946e8cc00 Mon Sep 17 00:00:00 2001
From: Amir Ayupov <aaupov@fb.com>
Date: Wed, 9 Mar 2022 20:24:20 -0800
Subject: [PATCH] [BOLT][NFC] Check errors from Obj.dynamicEntries

Addresses fuzzer crash

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D121336
---
 bolt/lib/Rewrite/RewriteInstance.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/bolt/lib/Rewrite/RewriteInstance.cpp b/bolt/lib/Rewrite/RewriteInstance.cpp
index 1c5d52b227e6..ea2cee1b01b0 100644
--- a/bolt/lib/Rewrite/RewriteInstance.cpp
+++ b/bolt/lib/Rewrite/RewriteInstance.cpp
@@ -5135,8 +5135,10 @@ Error RewriteInstance::readELFDynamic(ELFObjectFile<ELFT> *File) {
                              "dynamic section sizes should match");
 
   // Go through all dynamic entries to locate entries of interest.
-  typename ELFT::DynRange DynamicEntries =
-      cantFail(Obj.dynamicEntries(), "error accessing dynamic table");
+  auto DynamicEntriesOrErr = Obj.dynamicEntries();
+  if (!DynamicEntriesOrErr)
+    return DynamicEntriesOrErr.takeError();
+  typename ELFT::DynRange DynamicEntries = DynamicEntriesOrErr.get();
 
   for (const Elf_Dyn &Dyn : DynamicEntries) {
     switch (Dyn.d_tag) {