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Fix a memory corruption issue when vector resize 

There is memory corruption in below code

const Rect* prev = &dst[prevIndex];
dst.add(Rect(prev->right, top, right, bottom));

prev points to a memory of vector dst, when dst resize in add()
call, the memory that prev points to will be copy to the new
allocated vector memory and the old memory will become undefined

Avoid pointer in this case, use a local copy instead

Change-Id: I4d95ceedd00c8fb615ac153082ade1b1ce0d0fa8
This commit is contained in:
ywen 2015-03-26 19:51:12 +08:00 committed by Digish Pandya
parent a60ff367a4
commit aef0445c6f
1 changed files with 17 additions and 18 deletions
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35
libs/ui/Region.cpp
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@ -130,43 +130,42 @@ static void reverseRectsResolvingJunctions(const Rect* begin, const Rect* end,
// prevIndex can't be -1 here because if endLastSpan is set to a
// value greater than -1 (allowing the loop to execute),
// beginLastSpan (and therefore prevIndex) will also be increased
const Rect* prev = &dst[static_cast<size_t>(prevIndex)];
const Rect prev = dst[static_cast<size_t>(prevIndex)];
if (spanDirection == direction_RTL) {
// iterating over previous span RTL, quit if it's too far left
if (prev->right <= left) break;
if (prev.right <= left) break;
if (prev->right > left && prev->right < right) {
dst.add(Rect(prev->right, top, right, bottom));
right = prev->right;
if (prev.right > left && prev.right < right) {
dst.add(Rect(prev.right, top, right, bottom));
right = prev.right;
}
if (prev->left > left && prev->left < right) {
dst.add(Rect(prev->left, top, right, bottom));
right = prev->left;
if (prev.left > left && prev.left < right) {
dst.add(Rect(prev.left, top, right, bottom));
right = prev.left;
}
// if an entry in the previous span is too far right, nothing further left in the
// current span will need it
if (prev->left >= right) {
if (prev.left >= right) {
beginLastSpan = prevIndex;
}
} else {
// iterating over previous span LTR, quit if it's too far right
if (prev->left >= right) break;
if (prev.left >= right) break;
if (prev->left > left && prev->left < right) {
dst.add(Rect(left, top, prev->left, bottom));
left = prev->left;
if (prev.left > left && prev.left < right) {
dst.add(Rect(left, top, prev.left, bottom));
left = prev.left;
}
if (prev->right > left && prev->right < right) {
dst.add(Rect(left, top, prev->right, bottom));
left = prev->right;
if (prev.right > left && prev.right < right) {
dst.add(Rect(left, top, prev.right, bottom));
left = prev.right;
}
// if an entry in the previous span is too far left, nothing further right in the
// current span will need it
if (prev->right <= left) {
if (prev.right <= left) {
beginLastSpan = prevIndex;
}
}