[Webkit-unassigned] [Bug 116222] New: [GTK] Fix memory leak in WebKitBackForwardList

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=116222

           Summary: [GTK] Fix memory leak in WebKitBackForwardList
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rego at igalia.com


Valgrind traces show memory leak in WebKitBackForwardList::webkit_back_forward_list_get_forward_list() where the ImmutableArray is not been released.

The full trace:
    ==9902== 64 bytes in 2 blocks are definitely lost in loss record 5,228 of 8,400
    ==9902==    at 0x4C2A26B: malloc (vg_replace_malloc.c:270)
    ==9902==    by 0xDB174C8: WTF::fastMalloc(unsigned long) (FastMalloc.cpp:286)
    ==9902==    by 0x53A5D30: WTF::ThreadSafeRefCountedBase::operator new(unsigned long) (ThreadSafeRefCounted.h:72)
    ==9902==    by 0x53C578F: WebKit::ImmutableArray::create() (ImmutableArray.h:44)
    ==9902==    by 0x54C5A34: WebKit::WebBackForwardList::backListAsImmutableArrayWithLimit(unsigned int) const (WebBackForwardList.cpp:213)
    ==9902==    by 0x541918D: webkit_back_forward_list_get_back_list_with_limit (WebKitBackForwardList.cpp:255)
    ==9902==    by 0x40ABFF: browserWindowUpdateNavigationActions (BrowserWindow.c:222)
    ==9902==    by 0x40ACDA: backForwadlistChanged (BrowserWindow.c:235)
    ==9902==    by 0x56ACF86: webkit_marshal_VOID__OBJECT_POINTER (WebKitMarshal.cpp:520)
    ==9902==    by 0xC40E09F: g_closure_invoke (gclosure.c:777)
    ==9902==    by 0xC41F82F: signal_emit_unlocked_R (gsignal.c:3584)
    ==9902==    by 0xC427619: g_signal_emit_valist (gsignal.c:3328)
    ==9902==    by 0xC4278A1: g_signal_emit (gsignal.c:3384)
    ==9902==    by 0x5418C21: webkitBackForwardListChanged(_WebKitBackForwardList*, WebKit::WebBackForwardListItem*, WebKit::ImmutableArray*) (WebKitBackForwardList.cpp:144)
    ==9902==    by 0x542E96A: didChangeBackForwardList(OpaqueWKPage const*, OpaqueWKBackForwardListItem const*, OpaqueWKArray const*, void const*) (WebKitLoaderClient.cpp:128)
    ==9902==    by 0x54F7A31: WebKit::WebLoaderClient::didChangeBackForwardList(WebKit::WebPageProxy*, WebKit::WebBackForwardListItem*, WTF::Vector<WTF::RefPtr<WebKit::APIObject>, 0ul, WTF::CrashOnOverflow>*) (W
    ==9902==    by 0x5502525: WebKit::WebPageProxy::didChangeBackForwardList(WebKit::WebBackForwardListItem*, WTF::Vector<WTF::RefPtr<WebKit::APIObject>, 0ul, WTF::CrashOnOverflow>*) (WebPageProxy.cpp:874)
    ==9902==    by 0x54C5301: WebKit::WebBackForwardList::addItem(WebKit::WebBackForwardListItem*) (WebBackForwardList.cpp:130)
    ==9902==    by 0x550B589: WebKit::WebPageProxy::backForwardAddItem(unsigned long) (WebPageProxy.cpp:3026)
    ==9902==    by 0x569044E: void CoreIPC::callMemberFunction<WebKit::WebPageProxy, void (WebKit::WebPageProxy::*)(unsigned long), unsigned long>(CoreIPC::Arguments1<unsigned long> const&, WebKit::WebPageProxy*

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