[lld] [LLD]Fix lld crashes when linker script remove .dynsym section (PR #121488)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld-elf

Author: None (hstk30-hw)

<details>
<summary>Changes</summary>

Fix https://github.com/llvm/llvm-project/issues/88650

---
Full diff: https://github.com/llvm/llvm-project/pull/121488.diff


1 Files Affected:

- (modified) lld/ELF/SyntheticSections.cpp (+2-1) 


``````````diff
diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
index baa7a083404fe7..8d98aad50a6ceb 100644
--- a/lld/ELF/SyntheticSections.cpp
+++ b/lld/ELF/SyntheticSections.cpp
@@ -3800,7 +3800,8 @@ VersionTableSection::VersionTableSection(Ctx &ctx)
 void VersionTableSection::finalizeContents() {
   // At the moment of june 2016 GNU docs does not mention that sh_link field
   // should be set, but Sun docs do. Also readelf relies on this field.
-  getParent()->link = getPartition(ctx).dynSymTab->getParent()->sectionIndex;
+  if (OutputSection *sec = getPartition(ctx).dynSymTab->getParent())
+    getParent()->link = sec->sectionIndex;
 }
 
 size_t VersionTableSection::getSize() const {

``````````

</details>


https://github.com/llvm/llvm-project/pull/121488