diff options
Diffstat (limited to 'dom/base/nsMappedAttributes.cpp')
-rw-r--r-- | dom/base/nsMappedAttributes.cpp | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/dom/base/nsMappedAttributes.cpp b/dom/base/nsMappedAttributes.cpp index a3accd2a7..9e80c94df 100644 --- a/dom/base/nsMappedAttributes.cpp +++ b/dom/base/nsMappedAttributes.cpp @@ -62,11 +62,17 @@ nsMappedAttributes::Clone(bool aWillAddAttr) void* nsMappedAttributes::operator new(size_t aSize, uint32_t aAttrCount) CPP_THROW_NEW { - NS_ASSERTION(aAttrCount > 0, "zero-attribute nsMappedAttributes requested"); + size_t size = aSize + aAttrCount * sizeof(InternalAttr); // aSize will include the mAttrs buffer so subtract that. - void* newAttrs = ::operator new(aSize - sizeof(void*[1]) + - aAttrCount * sizeof(InternalAttr)); + // We don't want to under-allocate, however, so do not subtract + // if we have zero attributes. The zero attribute case only happens + // for <body>'s mapped attributes + if (aAttrCount != 0) { + size -= sizeof(void*[1]); + } + + void* newAttrs = ::operator new(size); #ifdef DEBUG static_cast<nsMappedAttributes*>(newAttrs)->mBufferSize = aAttrCount; |