Bug 277034 – Crash in GraphicsContext::drawImageBuffer

• Status: RESOLVED
• Resolution: FIXED
• Component: Compositing

[Ali Juma]

Created attachment 471960 [details]
Minimal test case

Filing this as a security bug since it was found using a fuzzer; there's no disclosure deadline for this bug.

This reproduces in an ASan build of WebKitTestRunner at 281262@main

Stack:
=================================================================
ERROR: AddressSanitizer: SEGV on unknown address 0x000000000010 (pc 0x000440a8d954 bp 0x7ff7b0a9b510 sp 0x7ff7b0a9b4a0 T0)
The signal is caused by a READ memory access.
Hint: address points to the zero page.
    #0 0x440a8d954 in WebCore::GraphicsContext::drawImageBuffer(WebCore::ImageBuffer&, WebCore::FloatRect const&, WebCore::ImagePaintingOptions)+0x84 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x83c0954)
    #1 0x440ae001f in WebCore::ImageBufferContextSwitcher::endDrawSourceImage(WebCore::GraphicsContext&, WebCore::DestinationColorSpace const&)+0x4ff (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x841301f)
    #2 0x44172563c in WebCore::RenderLayer::applyFilters(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::ClipRect const&)+0x27c (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x905863c)
    #3 0x44171d9b0 in WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x3220 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90509b0)
    #4 0x44171a6f9 in WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x1c9 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904d6f9)
    #5 0x4417171a6 in WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x4c6 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904a1a6)
    #6 0x441728d42 in WebCore::RenderLayer::paintList(WebCore::RenderLayer::LayerList, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x152 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x905bd42)
    #7 0x44171d8de in WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x314e (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90508de)
    #8 0x44171a6f9 in WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x1c9 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904d6f9)
    #9 0x4417171a6 in WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x4c6 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904a1a6)
    #10 0x4418ddc17 in WebCore::RenderReplica::paint(WebCore::PaintInfo&, WebCore::LayoutPoint const&)+0x407 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x9210c17)
    #11 0x441732691 in WebCore::RenderLayer::paintForegroundForFragmentsWithPhase(WebCore::PaintPhase, WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RenderObject*)+0x891 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x9065691)
    #12 0x44172942f in WebCore::RenderLayer::paintForegroundForFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebCore::GraphicsContext&, WebCore::GraphicsContext&, WebCore::LayoutRect const&, bool, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RenderObject*)+0x50f (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x905c42f)
    #13 0x44171d7a9 in WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x3019 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90507a9)
    #14 0x44171a6f9 in WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x1c9 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904d6f9)
    #15 0x44171a276 in WebCore::RenderLayer::paintLayerByApplyingTransform(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>, WebCore::LayoutSize const&)+0x976 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904d276)
    #16 0x441717876 in WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0xb96 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904a876)
    #17 0x44171a63a in WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x10a (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904d63a)
    #18 0x4417171a6 in WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x4c6 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904a1a6)
    #19 0x441728d42 in WebCore::RenderLayer::paintList(WebCore::RenderLayer::LayerList, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x152 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x905bd42)
    #20 0x44171d8de in WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x314e (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90508de)
    #21 0x44171a6f9 in WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x1c9 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904d6f9)
    #22 0x4417171a6 in WebCore::RenderLayer::paintLayerWithEffects(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x4c6 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x904a1a6)
    #23 0x441728d42 in WebCore::RenderLayer::paintList(WebCore::RenderLayer::LayerList, WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x152 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x905bd42)
    #24 0x44171d8de in WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>)+0x314e (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90508de)
    #25 0x44179b5c9 in WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RegionContext*)::$_40::operator()(WebCore::RenderLayer&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) const+0xad9 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90ce5c9)
    #26 0x441799fee in WebCore::RenderLayerBacking::paintIntoLayer(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::IntRect const&, WTF::OptionSet<WebCore::PaintBehavior>, WebCore::RegionContext*)+0x3ae (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90ccfee)
    #27 0x44179f5cb in WebCore::RenderLayerBacking::paintContents(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior>)+0x60b (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x90d25cb)
    #28 0x440ab17a6 in WebCore::GraphicsLayer::paintGraphicsLayerContents(WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior>)+0x2e6 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x83e47a6)
    #29 0x440cb0f1f in WebCore::GraphicsLayerCA::platformCALayerPaintContents(WebCore::PlatformCALayer*, WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior>)+0x1df (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x85e3f1f)
    #30 0x43bdd848b in WebCore::PlatformCALayer::drawLayerContents(WebCore::GraphicsContext&, WebCore::PlatformCALayer*, WTF::Vector<WebCore::FloatRect, 5ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior>)+0x2ab (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x370b48b)
    #31 0x440d42623 in WebCore::TileGrid::platformCALayerPaintContents(WebCore::PlatformCALayer*, WebCore::GraphicsContext&, WebCore::FloatRect const&, WTF::OptionSet<WebCore::GraphicsLayerPaintBehavior>)+0x2f3 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x8675623)
    #32 0x40c9363a4 in WebKit::RemoteLayerBackingStore::drawInContext(WebCore::GraphicsContext&)+0x2e4 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x1a463a4)
    #33 0x40c986201 in WebKit::RemoteLayerWithRemoteRenderingBackingStore::createContextAndPaintContents()+0x71 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x1a96201)
    #34 0x40c935803 in WebKit::RemoteLayerBackingStore::paintContents()+0xa83 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x1a45803)
    #35 0x40c93ffe1 in WebKit::RemoteLayerBackingStoreCollection::paintReachableBackingStoreContents()+0x351 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x1a4ffe1)
    #36 0x40de76216 in WebKit::RemoteLayerTreeContext::buildTransaction(WebKit::RemoteLayerTreeTransaction&, WebCore::PlatformCALayer&, WebCore::ProcessQualified<WTF::ObjectIdentifierGeneric<WebCore::FrameIdentifierType, WTF::ObjectIdentifierMainThreadAccessTraits<unsigned long long>, unsigned long long>>)+0x276 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x2f86216)
    #37 0x40c0bfb53 in WebKit::RemoteLayerTreeDrawingArea::updateRendering()+0xc73 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x11cfb53)
    #38 0x4406f1576 in WebCore::ThreadTimers::sharedTimerFiredInternal()+0x2d6 (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x8024576)
    #39 0x4407f414d in WebCore::timerFired(__CFRunLoopTimer*, void*)+0x7d (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x812714d)
    #40 0x7ff80886544b in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__+0x13 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64h+0x9744b)
    #41 0x7ff808864ff9 in __CFRunLoopDoTimer+0x310 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64h+0x96ff9)
    #42 0x7ff808864c35 in __CFRunLoopDoTimers+0x11c (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64h+0x96c35)
    #43 0x7ff808848f11 in __CFRunLoopRun+0x837 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64h+0x7af11)
    #44 0x7ff808848111 in CFRunLoopRunSpecific+0x22c (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64h+0x7a111)
    #45 0x7ff8097f9b10 in -[NSRunLoop(NSRunLoop) runMode:beforeDate:]+0xd7 (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation:x86_64+0x5cb10)
    #46 0x7ff80987c90a in -[NSRunLoop(NSRunLoop) run]+0x4b (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation:x86_64+0xdf90a)
    #47 0x7ff8084863f8 in _xpc_objc_main+0x25d (/usr/lib/system/libxpc.dylib:x86_64+0x163f8)
    #48 0x7ff808492fa2 in _xpc_main+0x102 (/usr/lib/system/libxpc.dylib:x86_64+0x22fa2)
    #49 0x7ff80848601b in xpc_main+0x37 (/usr/lib/system/libxpc.dylib:x86_64+0x1601b)
    #50 0x40c92ef2a in WebKit::XPCServiceMain(int, char const**)+0x9a (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x1a3ef2a)
    #51 0x7ff8083e1365 in start+0x795 (/usr/lib/dyld:x86_64+0xfffffffffff5c365)
==77758==Register values:
rax = 0x0000000000000010  rbx = 0x00001ffef6153694  rcx = 0x00007ff7b0a9b4c0  rdx = 0x00006040001360a8
rdi = 0x000062000000f080  rsi = 0x0000000000000000  rbp = 0x00007ff7b0a9b510  rsp = 0x00007ff7b0a9b4a0
 r8 = 0x0000000000001221   r9 = 0x0000100000000000  r10 = 0x0000100000000000  r11 = 0x000060c000085c00
r12 = 0x0000604000136098  r13 = 0x00001ffef61536a8  r14 = 0x00006040001360a8  r15 = 0x00001ffef61536d4

[Radar WebKit Bug Importer]

<rdar://problem/132434375>

[Ryosuke Niwa]

Not a security bug

[Adan Lopez]

Pull request: https://github.com/WebKit/WebKit/pull/34540

[EWS]

Committed 284812@main (94f6264db37e): <https://commits.webkit.org/284812@main>

Reviewed commits have been landed. Closing PR #34540 and removing active labels.

[EWS]

Committed 283286.230@safari-7620-branch (9772c55ec147): <https://commits.webkit.org/283286.230@safari-7620-branch>

Reviewed commits have been landed. Closing PR #1994 and removing active labels.