[Webkit-unassigned] [Bug 239340] New: -Wstringop-overflow warning in DocumentWriter.cpp

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239340

            Bug ID: 239340
           Summary: -Wstringop-overflow warning in DocumentWriter.cpp
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at gnome.org

-Wstringop-overflow warnings are *usually* false positives. I will need to look closer at this one:

[3703/6690] Building CXX object Source/WebCore/CMakeFiles/...ivedSources/unified-sources/UnifiedSource-c57e08af-2.cpp.o
In file included from /usr/include/c++/12/bits/shared_ptr_atomic.h:33,
                 from /usr/include/c++/12/memory:78,
                 from /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/StdLibExtras.h:30,
                 from /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/FastMalloc.h:26,
                 from /home/mcatanzaro/Projects/WebKit/Source/WebCore/config.h:56,
                 from /home/mcatanzaro/Projects/WebKit/Source/WebCore/loader/CrossOriginPreflightResultCache.cpp:27,
                 from /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WebCore/DerivedSources/unified-sources/UnifiedSource-c57e08af-2.cpp:1:
In member function ‘std::__atomic_base<_IntTp>::__int_type std::__atomic_base<_IntTp>::operator++() [with _ITp = unsigned int]’,
    inlined from ‘void WTF::ThreadSafeRefCountedBase::ref() const’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/ThreadSafeRefCounted.h:60:9,
    inlined from ‘WTF::Ref<T, <template-parameter-1-2> >::Ref(T&) [with T = WebCore::Frame; Traits = WTF::RawPtrTraits<WebCore::Frame>]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/Ref.h:67:19,
    inlined from ‘void WebCore::DocumentWriter::end()’ at /home/mcatanzaro/Projects/WebKit/Source/WebCore/loader/DocumentWriter.cpp:299:32:
/usr/include/c++/12/bits/atomic_base.h:385:34: warning: ‘unsigned int __atomic_add_fetch_4(volatile void*, unsigned int, int)’ writing 4 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
  385 |       { return __atomic_add_fetch(&_M_i, 1, int(memory_order_seq_cst)); }
      |                ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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