<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>296427</bug_id>
          
          <creation_ts>2025-07-24 05:39:12 -0700</creation_ts>
          <short_desc>Crash in WebCore::FragmentedSharedBuffer::takeData</short_desc>
          <delta_ts>2025-07-25 22:33:35 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Media</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Jean-Yves Avenard [:jya]">jean-yves.avenard</reporter>
          <assigned_to name="Jean-Yves Avenard [:jya]">jean-yves.avenard</assigned_to>
          <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>2132285</commentid>
    <comment_count>0</comment_count>
    <who name="Jean-Yves Avenard [:jya]">jean-yves.avenard</who>
    <bug_when>2025-07-24 05:39:12 -0700</bug_when>
    <thetext>```
        22 bool WTF::VectorBufferBase&lt;unsigned char, WTF::FastMalloc&gt;::allocateBuffer&lt;(WTF::FailureAction)0&gt;(unsigned long) (WebCore)
          22 bool WTF::Vector&lt;unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt;::reserveInitialCapacity&lt;(WTF::FailureAction)0&gt;(unsigned long) (WebCore)
            22 WTF::Vector&lt;unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt;::reserveInitialCapacity(unsigned long) (WebCore)
              22 WebCore::combineSegmentsData(WTF::Vector&lt;WebCore::FragmentedSharedBuffer::DataSegmentVectorEntry, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc&gt; const&amp;, unsigned long) (WebCore)
        ==&gt; 22 WebCore::FragmentedSharedBuffer::takeData() (WebCore) &lt;==
                  22 WebCore::FragmentedSharedBuffer::extractData() (WebCore)
                    22 WebCore::FetchBodyConsumer::takeAsBlob(WebCore::ScriptExecutionContext*, WTF::String const&amp;) (WebCore)
                      22 auto WebCore::FetchBodyConsumer::resolve(WTF::Ref&lt;WebCore::DeferredPromise, WTF::RawPtrTraits&lt;WebCore::DeferredPromise&gt;, WTF::DefaultRefDerefTraits&lt;WebCore::DeferredPromise&gt;&gt;&amp;&amp;, WTF::String const&amp;, WebCore::FetchBodyOwner*, WebCore::ReadableStream*)::$_1::operator()&lt;WebCore::ScriptExecutionContext&gt;(WebCore::ScriptExecutionContext&amp;) const (WebCore)
                        22 WTF::Detail::CallableWrapper&lt;WebCore::FetchBodyConsumer::resolve(WTF::Ref&lt;WebCore::DeferredPromise, WTF::RawPtrTraits&lt;WebCore::DeferredPromise&gt;, WTF::DefaultRefDerefTraits&lt;WebCore::DeferredPromise&gt;&gt;&amp;&amp;, WTF::String const&amp;, WebCore::FetchBodyOwner*, WebCore::ReadableStream*)::$_1, WTF::Ref&lt;WebCore::Blob, WTF::RawPtrTraits&lt;WebCore::Blob&gt;, WTF::DefaultRefDerefTraits&lt;WebCore::Blob&gt;&gt;, WebCore::ScriptExecutionContext&amp;&gt;::call(WebCore::ScriptExecutionContext&amp;) (WebCore)
                          22 WTF::Function&lt;WTF::Ref&lt;WebCore::Blob, WTF::RawPtrTraits&lt;WebCore::Blob&gt;, WTF::DefaultRefDerefTraits&lt;WebCore::Blob&gt;&gt; (WebCore::ScriptExecutionContext&amp;)&gt;::operator()(WebCore::ScriptExecutionContext&amp;) const (WebCore)
                            22 void WebCore::DeferredPromise::resolveCallbackValueWithNewlyCreated&lt;WebCore::IDLInterface&lt;WebCore::Blob&gt;&gt;(WTF::Function&lt;WebCore::IDLInterface&lt;WebCore::Blob&gt;::InnerParameterType (WebCore::ScriptExecutionContext&amp;)&gt; const&amp;) (WebCore)
                              22 WebCore::FetchBodyConsumer::resolve(WTF::Ref&lt;WebCore::DeferredPromise, WTF::RawPtrTraits&lt;WebCore::DeferredPromise&gt;, WTF::DefaultRefDerefTraits&lt;WebCore::DeferredPromise&gt;&gt;&amp;&amp;, WTF::String const&amp;, WebCore::FetchBodyOwner*, WebCore::ReadableStream*) (WebCore)
                                22 WebCore::FetchBodyConsumer::loadingSucceeded(WTF::String const&amp;) (WebCore)
                                  22 WebCore::FetchBody::loadingSucceeded(WTF::String const&amp;) (WebCore)
                                    22 WebCore::FetchResponse::didSucceed(WebCore::NetworkLoadMetrics const&amp;) (WebCore)
                                      22 WebCore::FetchResponse::Loader::didSucceed(WebCore::NetworkLoadMetrics const&amp;) (WebCore)
                                        22 WebCore::DocumentThreadableLoader::didFinishLoading(std::__1::optional&lt;WTF::ObjectIdentifierGeneric&lt;WebCore::ResourceLoaderIdentifierType, WTF::ObjectIdentifierThreadSafeAccessTraits&lt;unsigned long long&gt;, unsigned long long&gt;&gt;, WebCore::NetworkLoadMetrics const&amp;) (WebCore)
                                          22 WebCore::CachedResource::checkNotify(WebCore::NetworkLoadMetrics const&amp;, WebCore::LoadWillContinueInAnotherProcess) (WebCore)
                                            22 WebCore::CachedResource::finishLoading(WebCore::FragmentedSharedBuffer const*, WebCore::NetworkLoadMetrics const&amp;) (WebCore)
                                              22 WebCore::CachedRawResource::finishLoading(WebCore::FragmentedSharedBuffer const*, WebCore::NetworkLoadMetrics const&amp;) (WebCore)
                                                22 WebCore::SubresourceLoader::didFinishLoading(WebCore::NetworkLoadMetrics const&amp;) (WebCore)
                                                  22 WebKit::WebResourceLoader::didFinishResourceLoad(WebCore::NetworkLoadMetrics&amp;&amp;) (WebKit)
                                                    22 auto void IPC::callMemberFunction&lt;WebKit::WebResourceLoader, WebKit::WebResourceLoader, void (WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&gt;(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&amp;&amp;)::&apos;lambda&apos;(auto&amp;&amp;...)::operator()&lt;WebCore::NetworkLoadMetrics&gt;(auto&amp;&amp;...) const (WebKit)
                                                      22 decltype(std::declval&lt;WebKit::WebResourceLoader&gt;()(std::declval&lt;WebCore::NetworkLoadMetrics&gt;())) std::__1::__invoke[abi:sn200100]&lt;void IPC::callMemberFunction&lt;WebKit::WebResourceLoader, WebKit::WebResourceLoader, void (WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&gt;(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&amp;&amp;)::&apos;lambda&apos;(auto&amp;&amp;...), WebCore::NetworkLoadMetrics&gt;(WebKit::WebResourceLoader&amp;&amp;, WebCore::NetworkLoadMetrics&amp;&amp;) (WebKit)
                                                        22 decltype(auto) std::__1::__apply_tuple_impl[abi:sn200100]&lt;void IPC::callMemberFunction&lt;WebKit::WebResourceLoader, WebKit::WebResourceLoader, void (WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&gt;(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&amp;&amp;)::&apos;lambda&apos;(auto&amp;&amp;...), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;, 0ul&gt;(WebKit::WebResourceLoader&amp;&amp;, WebKit::WebResourceLoader&amp;&amp;, std::__1::__tuple_indices&lt;0ul&gt;) (WebKit)
                                                          22 decltype(auto) std::__1::apply[abi:sn200100]&lt;void IPC::callMemberFunction&lt;WebKit::WebResourceLoader, WebKit::WebResourceLoader, void (WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&gt;(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&amp;&amp;)::&apos;lambda&apos;(auto&amp;&amp;...), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&gt;(WebKit::WebResourceLoader&amp;&amp;, WebKit::WebResourceLoader&amp;&amp;) (WebKit)
                                                            22 void IPC::callMemberFunction&lt;WebKit::WebResourceLoader, WebKit::WebResourceLoader, void (WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&gt;(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics&amp;&amp;), std::__1::tuple&lt;WebCore::NetworkLoadMetrics&gt;&amp;&amp;) (WebKit)
                                                              22 void IPC::handleMessage&lt;Messages::WebResourceLoader::DidFinishResourceLoad, IPC::Connection, WebKit::WebResourceLoader, WebKit::WebResourceLoader, void (WebCore::NetworkLoadMetrics&amp;&amp;)&gt;(IPC::Connection&amp;, IPC::Decoder&amp;, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics&amp;&amp;)) (WebKit)
                                                                22 WebKit::WebResourceLoader::didReceiveMessage(IPC::Connection&amp;, IPC::Decoder&amp;) (WebKit)
                                                                  22 WebKit::NetworkProcessConnection::dispatchMessage(IPC::Connection&amp;, IPC::Decoder&amp;) (WebKit)
                                                                    22 WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&amp;, IPC::Decoder&amp;) (WebKit)
                                                                      22 IPC::Connection::dispatchMessage(IPC::Decoder&amp;) (WebKit)
                                                                        22 IPC::Connection::dispatchMessage(WTF::UniqueRef&lt;IPC::Decoder&gt;) (WebKit)
                                                                          22 IPC::Connection::dispatchOneIncomingMessage() (WebKit)
                                                                            22 IPC::Connection::enqueueIncomingMessage(WTF::UniqueRef&lt;IPC::Decoder&gt;)::$_2::operator()() const (WebKit)
                                                                              22 WTF::Detail::CallableWrapper&lt;IPC::Connection::enqueueIncomingMessage(WTF::UniqueRef&lt;IPC::Decoder&gt;)::$_2, void&gt;::call() (WebKit)
                                                                                22 WTF::Function&lt;void ()&gt;::operator()() const (JavaScriptCore)
                                                                                  22 WTF::RunLoop::performWork() (JavaScriptCore)
                                                                                    22 WTF::RunLoop::performWork(void*) (JavaScriptCore)
                                                                                      22 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (CoreFoundation)
                                                                                        22 __CFRunLoopDoSource0 (CoreFoundation)
                                                                                          22 __CFRunLoopDoSources0 (CoreFoundation)
                                                                                            22 __CFRunLoopRun (CoreFoundation)
                                                                                              22 _CFRunLoopRunSpecificWithOptions (CoreFoundation)
                                                                                                22 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] (Foundation)
                                                                                                  22 -[NSRunLoop(NSRunLoop) run] (Foundation)
                                                                                                    22 _xpc_objc_main (libxpc.dylib)
                                                                                                      22 _xpc_main (libxpc.dylib)
                                                                                                        22 xpc_main (libxpc.dylib)
                                                                                                          22 WebKit::XPCServiceMain(int, char const**) (WebKit)
                                                                                                            22 start (dyld)
```</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2132286</commentid>
    <comment_count>1</comment_count>
    <who name="Jean-Yves Avenard [:jya]">jean-yves.avenard</who>
    <bug_when>2025-07-24 05:41:01 -0700</bug_when>
    <thetext>rdar://155578324</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2132287</commentid>
    <comment_count>2</comment_count>
    <who name="Jean-Yves Avenard [:jya]">jean-yves.avenard</who>
    <bug_when>2025-07-24 05:51:31 -0700</bug_when>
    <thetext>Pull request: https://github.com/WebKit/WebKit/pull/48473</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2132644</commentid>
    <comment_count>3</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2025-07-25 22:33:34 -0700</bug_when>
    <thetext>Committed 297885@main (59ff57feba67): &lt;https://commits.webkit.org/297885@main&gt;

Reviewed commits have been landed. Closing PR #48473 and removing active labels.</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>