[clang] [NFC][Clang] Fix static analyzer bugs with dereference after null checks (PR #86018)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-codegen

Author: None (smanna12)

<details>
<summary>Changes</summary>

This patch fixes potential dereferences in <unnamed>::MappableExprsHandler::generateInfoForComponentList() for passing null pointer OASE to EmitOMPArraySectionExpr().

---
Full diff: https://github.com/llvm/llvm-project/pull/86018.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CGOpenMPRuntime.cpp (+2-2) 


``````````diff
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index e8a68dbcc68709..e89a5368fb2f71 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -7431,7 +7431,7 @@ class MappableExprsHandler {
           if (!PartialStruct.Base.isValid()) {
             PartialStruct.LowestElem = {FieldIndex, LowestElem};
             if (IsFinalArraySection) {
-              Address HB =
+              Address HB = OASE &&
                   CGF.EmitOMPArraySectionExpr(OASE, /*IsLowerBound=*/false)
                       .getAddress(CGF);
               PartialStruct.HighestElem = {FieldIndex, HB};
@@ -7444,7 +7444,7 @@ class MappableExprsHandler {
             PartialStruct.LowestElem = {FieldIndex, LowestElem};
           } else if (FieldIndex > PartialStruct.HighestElem.first) {
             if (IsFinalArraySection) {
-              Address HB =
+              Address HB = OASE &&
                   CGF.EmitOMPArraySectionExpr(OASE, /*IsLowerBound=*/false)
                       .getAddress(CGF);
               PartialStruct.HighestElem = {FieldIndex, HB};

``````````

</details>


https://github.com/llvm/llvm-project/pull/86018