Guard against nullptr #94084
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Guard against nullptr #94084
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llvmbot
added
clang
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@llvm/pr-subscribers-clang Author: None (Sterling-Augustine) ChangesFull diff: https://github.com/llvm/llvm-project/pull/94084.diff 1 Files Affected:
diff --git a/clang/lib/AST/QualTypeNames.cpp b/clang/lib/AST/QualTypeNames.cpp
index 066377423df76..18ac4b1eb57e7 100644
--- a/clang/lib/AST/QualTypeNames.cpp
+++ b/clang/lib/AST/QualTypeNames.cpp
@@ -65,8 +65,9 @@ static bool getFullyQualifiedTemplateName(const ASTContext &Ctx,
assert(ArgTDecl != nullptr);
QualifiedTemplateName *QTName = TName.getAsQualifiedTemplateName();
- if (QTName && !QTName->hasTemplateKeyword()) {
- NNS = QTName->getQualifier();
+ if (QTName &&
+ !QTName->hasTemplateKeyword() &&
+ (NNS = QTName->getQualifier())) {
NestedNameSpecifier *QNNS = getFullyQualifiedNestedNameSpecifier(
Ctx, NNS, WithGlobalNsPrefix);
if (QNNS != NNS) {
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You can test this locally with the following command:git-clang-format --diff bba5ee47e63298d61f6ea441a140144ce370ba92 169e09f2aa403676873a440d8496356cefe69b9e -- clang/lib/AST/QualTypeNames.cppView the diff from clang-format here.diff --git a/clang/lib/AST/QualTypeNames.cpp b/clang/lib/AST/QualTypeNames.cpp
index 18ac4b1eb5..737092b156 100644
--- a/clang/lib/AST/QualTypeNames.cpp
+++ b/clang/lib/AST/QualTypeNames.cpp
@@ -65,8 +65,7 @@ static bool getFullyQualifiedTemplateName(const ASTContext &Ctx,
assert(ArgTDecl != nullptr);
QualifiedTemplateName *QTName = TName.getAsQualifiedTemplateName();
- if (QTName &&
- !QTName->hasTemplateKeyword() &&
+ if (QTName && !QTName->hasTemplateKeyword() &&
(NNS = QTName->getQualifier())) {
NestedNameSpecifier *QNNS = getFullyQualifiedNestedNameSpecifier(
Ctx, NNS, WithGlobalNsPrefix);
|
qtprojectorg
pushed a commit
to qt/qttools
that referenced
this pull request
Sep 17, 2024
For compatibility reasons, QDoc carries a custom implementation of `llvm-project.git/clang/lib/AST/QualTypeNames.cpp`. When QDoc is built against Clang libraries from LLVM 19, a segmentation fault occurs when generating the documentation for the Qt 3D module as part of a qt5.git super-module documentation build. The segmentation fault is the result of a `nullptr` being passed to `clang::TypeName::getFullyQualifiedNestedNameSpecifier` for the `Scope` parameter. Upon investigation, it became clear that two changes have been made upstream to the implementation QDoc carries a customized version of, one of which adds a `nullptr` check. Due to the small footprint of both changes, this patch applies both of them to QDoc's `clang/AST/QualTypeNames.h`: - The upstream change 16832eb58563f77d917198ad9f86db1c2ee162c9 adds a `nullptr` check, see llvm/llvm-project#94084 for details. - The upstream change 35bfbb3b21e9874d03b730e8ce4eb98b1dcd2d28 replaces `dyn_cast_or_null<T>(foo)` with `dyn_cast<T>(foo)` for never-null arguments. The changes apply also when QDoc is built against Clang libraries from LLVM 17 and 18, with both end-to-end tests passing. Given the nature of the changes, this means these adaptations do not require being wrapped in `#if LIBCLANG_VERSION_MAJOR` checks. Fixes: QTBUG-128926 Change-Id: I5863ca213a35042ed325971b42de2bc1e86c6457 Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
qtprojectorg
pushed a commit
to qt/qttools
that referenced
this pull request
Sep 18, 2024
For compatibility reasons, QDoc carries a custom implementation of `llvm-project.git/clang/lib/AST/QualTypeNames.cpp`. When QDoc is built against Clang libraries from LLVM 19, a segmentation fault occurs when generating the documentation for the Qt 3D module as part of a qt5.git super-module documentation build. The segmentation fault is the result of a `nullptr` being passed to `clang::TypeName::getFullyQualifiedNestedNameSpecifier` for the `Scope` parameter. Upon investigation, it became clear that two changes have been made upstream to the implementation QDoc carries a customized version of, one of which adds a `nullptr` check. Due to the small footprint of both changes, this patch applies both of them to QDoc's `clang/AST/QualTypeNames.h`: - The upstream change 16832eb58563f77d917198ad9f86db1c2ee162c9 adds a `nullptr` check, see llvm/llvm-project#94084 for details. - The upstream change 35bfbb3b21e9874d03b730e8ce4eb98b1dcd2d28 replaces `dyn_cast_or_null<T>(foo)` with `dyn_cast<T>(foo)` for never-null arguments. See llvm/llvm-project@35bfbb3 for details. The changes apply also when QDoc is built against Clang libraries from LLVM 17 and 18, with both end-to-end tests passing. Given the nature of the changes, this means these adaptations do not require being wrapped in `#if LIBCLANG_VERSION_MAJOR` checks. Fixes: QTBUG-128926 Pick-to: 6.8 Change-Id: I5863ca213a35042ed325971b42de2bc1e86c6457 Reviewed-by: Luca Di Sera <luca.disera@qt.io> Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
qtprojectorg
pushed a commit
to qt/qttools
that referenced
this pull request
Sep 18, 2024
For compatibility reasons, QDoc carries a custom implementation of `llvm-project.git/clang/lib/AST/QualTypeNames.cpp`. When QDoc is built against Clang libraries from LLVM 19, a segmentation fault occurs when generating the documentation for the Qt 3D module as part of a qt5.git super-module documentation build. The segmentation fault is the result of a `nullptr` being passed to `clang::TypeName::getFullyQualifiedNestedNameSpecifier` for the `Scope` parameter. Upon investigation, it became clear that two changes have been made upstream to the implementation QDoc carries a customized version of, one of which adds a `nullptr` check. Due to the small footprint of both changes, this patch applies both of them to QDoc's `clang/AST/QualTypeNames.h`: - The upstream change 16832eb58563f77d917198ad9f86db1c2ee162c9 adds a `nullptr` check, see llvm/llvm-project#94084 for details. - The upstream change 35bfbb3b21e9874d03b730e8ce4eb98b1dcd2d28 replaces `dyn_cast_or_null<T>(foo)` with `dyn_cast<T>(foo)` for never-null arguments. See llvm/llvm-project@35bfbb3 for details. The changes apply also when QDoc is built against Clang libraries from LLVM 17 and 18, with both end-to-end tests passing. Given the nature of the changes, this means these adaptations do not require being wrapped in `#if LIBCLANG_VERSION_MAJOR` checks. Fixes: QTBUG-128926 Change-Id: I5863ca213a35042ed325971b42de2bc1e86c6457 Reviewed-by: Luca Di Sera <luca.disera@qt.io> Reviewed-by: Topi Reiniö <topi.reinio@qt.io> (cherry picked from commit a2f478b) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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Protect against nullptr after #93926