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Bug 1158540 - Don't repeat the mRefCnt member of URLValue in ImageValue; r=dbaron

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Even after this patch, it's not OK to AddRef an ImageValue and then call
Release on its base pointer (URLValue) since URLValue refcounting methods
are not virtual, so it would confuse the leak checker, but at least it
wouldn't cause UAF issues since we'd still be looking at the same mRefCnt
member.
This commit is contained in:
Ehsan Akhgari 2015-04-25 09:23:19 -04:00
parent ff7f03df2f
commit c01a19936d
2 changed files with 6 additions and 3 deletions
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3
layout/style/nsCSSValue.cpp
View File

@ -2464,6 +2464,9 @@ css::ImageValue::~ImageValue()
mRequests.Enumerate(&ClearRequestHashtable, this);
}
NS_IMPL_ADDREF(css::ImageValue)
NS_IMPL_RELEASE(css::ImageValue)
nsCSSValueGradientStop::nsCSSValueGradientStop()
: mLocation(eCSSUnit_None),
mColor(eCSSUnit_Null),

6
layout/style/nsCSSValue.h
View File

@ -137,9 +137,9 @@ public:
nsRefPtrHashtable<nsPtrHashKey<nsISupports>, imgRequestProxy> mRequests;
// Override AddRef and Release to not only log ourselves correctly, but
// also so that we delete correctly without a virtual destructor
NS_INLINE_DECL_REFCOUNTING(ImageValue)
// Override AddRef and Release to log ourselves correctly.
NS_METHOD_(MozExternalRefCountType) AddRef();
NS_METHOD_(MozExternalRefCountType) Release();
};
struct GridNamedArea {