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Fix potential length-miscalculation in %StringBuilderConcat.

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Review URL: http://codereview.chromium.org/521074


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3568 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
lrn@chromium.org 2010-01-08 11:27:37 +00:00
parent dcd89af437
commit 2cb1f8271f
1 changed files with 8 additions and 5 deletions
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13
src/runtime.cc
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@ -1524,7 +1524,7 @@ class ReplacementStringBuilder {
void IncrementCharacterCount(int by) {
if (character_count_ > Smi::kMaxValue - by) {
if (character_count_ > String::kMaxLength - by) {
V8::FatalProcessOutOfMemory("String.replace result too large.");
}
character_count_ += by;
@ -3384,6 +3384,7 @@ static Object* Runtime_URIEscape(Arguments args) {
escaped_length += 3;
}
// We don't allow strings that are longer than a maximal length.
ASSERT(String::kMaxLength < 0x7fffffff - 6); // Cannot overflow.
if (escaped_length > String::kMaxLength) {
Top::context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
@ -3960,6 +3961,7 @@ static Object* Runtime_StringBuilderConcat(Arguments args) {
bool ascii = special->IsAsciiRepresentation();
int position = 0;
int increment = 0;
for (int i = 0; i < array_length; i++) {
Object* elt = fixed_array->get(i);
if (elt->IsSmi()) {
@ -3972,10 +3974,10 @@ static Object* Runtime_StringBuilderConcat(Arguments args) {
if (pos + len > special_length) {
return Top::Throw(Heap::illegal_argument_symbol());
}
position += len;
increment = len;
} else {
// Position and length encoded in two smis.
position += (-len);
increment = (-len);
// Get the position and check that it is also a smi.
i++;
if (i >= array_length) {
@ -3989,17 +3991,18 @@ static Object* Runtime_StringBuilderConcat(Arguments args) {
} else if (elt->IsString()) {
String* element = String::cast(elt);
int element_length = element->length();
position += element_length;
increment = element_length;
if (ascii && !element->IsAsciiRepresentation()) {
ascii = false;
}
} else {
return Top::Throw(Heap::illegal_argument_symbol());
}
if (position > String::kMaxLength) {
if (increment > String::kMaxLength - position) {
Top::context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
position += increment;
}
int length = position;