[LLD]Fix lld crashes when linker script remove .dynsym section

hstk30-hw · web-flow · commit 759f8f490e76 · 2025-01-02T23:43:59.000+08:00
diff --git 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 {

Original file line number	Diff line number	Diff line change
`@@ -3800,7 +3800,8 @@ VersionTableSection::VersionTableSection(Ctx &ctx)`
`3800`	`3800`	`void VersionTableSection::finalizeContents() {`
`3801`	`3801`	`// At the moment of june 2016 GNU docs does not mention that sh_link field`
`3802`	`3802`	`// should be set, but Sun docs do. Also readelf relies on this field.`
`3803`		`- getParent()->link = getPartition(ctx).dynSymTab->getParent()->sectionIndex;`
	`3803`	`+ if (OutputSection *sec = getPartition(ctx).dynSymTab->getParent())`
	`3804`	`+ getParent()->link = sec->sectionIndex;`
`3804`	`3805`	`}`
`3805`	`3806`
`3806`	`3807`	`size_t VersionTableSection::getSize() const {`