[llvm] [NFC,SHT_LLVM_BB_ADDR_MAP] Fix ub in ELF.cpp. (PR #115830)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-binary-utilities

Author: Rahman Lavaee (rlavaee)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/115830.diff


1 Files Affected:

- (modified) llvm/lib/Object/ELF.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Object/ELF.cpp b/llvm/lib/Object/ELF.cpp
index 9a9e762d1e51d6..545a672c05c8a3 100644
--- a/llvm/lib/Object/ELF.cpp
+++ b/llvm/lib/Object/ELF.cpp
@@ -823,7 +823,6 @@ decodeBBAddrMapImpl(const ELFFile<ELFT> &EF,
     uint32_t NumBlocksInBBRange = 0;
     uint32_t NumBBRanges = 1;
     typename ELFFile<ELFT>::uintX_t RangeBaseAddress = 0;
-    std::vector<BBAddrMap::BBEntry> BBEntries;
     if (FeatEnable.MultiBBRange) {
       NumBBRanges = readULEB128As<uint32_t>(Data, Cur, ULEBSizeErr);
       if (!Cur || ULEBSizeErr)
@@ -851,6 +850,7 @@ decodeBBAddrMapImpl(const ELFFile<ELFT> &EF,
         RangeBaseAddress = *AddressOrErr;
         NumBlocksInBBRange = readULEB128As<uint32_t>(Data, Cur, ULEBSizeErr);
       }
+      std::vector<BBAddrMap::BBEntry> BBEntries;
       for (uint32_t BlockIndex = 0; !MetadataDecodeErr && !ULEBSizeErr && Cur &&
                                     (BlockIndex < NumBlocksInBBRange);
            ++BlockIndex) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/115830