[lld] ce5de93 - [ELF] Disallow out-of-range section group indices after D70146

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2019-11-19T09:49:45-08:00
New Revision: ce5de93e838f7391760ba2956c7e0ae5d203cb6f

URL: https://github.com/llvm/llvm-project/commit/ce5de93e838f7391760ba2956c7e0ae5d203cb6f
DIFF: https://github.com/llvm/llvm-project/commit/ce5de93e838f7391760ba2956c7e0ae5d203cb6f.diff

LOG: [ELF] Disallow out-of-range section group indices after D70146

Exposed by invalid/sht-group-wrong-section.test
http://45.33.8.238/win/2613/step_9.txt

Added: 
    

Modified: 
    lld/ELF/InputFiles.cpp

Removed: 
    


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diff  --git a/lld/ELF/InputFiles.cpp b/lld/ELF/InputFiles.cpp
index 0026aeef58db..7dc72361abd7 100644
--- a/lld/ELF/InputFiles.cpp
+++ b/lld/ELF/InputFiles.cpp
@@ -621,6 +621,8 @@ void ObjFile<ELFT>::initializeSections(bool ignoreComdats) {
     InputSectionBase *head;
     InputSectionBase *prev = nullptr;
     for (uint32_t secIndex : entries.slice(1)) {
+      if (secIndex >= this->sections.size())
+        continue;
       InputSectionBase *s = this->sections[secIndex];
       if (!s || s == &InputSection::discarded)
         continue;