rleigh-codelibre commented on code in PR #51:
URL: https://github.com/apache/xerces-c/pull/51#discussion_r986030234
##########
src/xercesc/validators/common/DFAContentModel.cpp:
##########
@@ -661,8 +662,15 @@ void DFAContentModel::buildDFA(ContentSpecNode* const
curNode)
// in the fLeafCount member.
//
fLeafCount=countLeafNodes(curNode);
+ // Avoid integer overflow in below fLeafCount++ increment
+ if (fLeafCount > std::numeric_limits<unsigned int>::max() - 1)
Review Comment:
Should this be `XMLSize_t` (a.k.a. `size_t`) rather than `unsigned int` to
match the type of `fLeafCount`?
##########
src/xercesc/validators/common/DFAContentModel.cpp:
##########
@@ -661,8 +662,15 @@ void DFAContentModel::buildDFA(ContentSpecNode* const
curNode)
// in the fLeafCount member.
//
fLeafCount=countLeafNodes(curNode);
+ // Avoid integer overflow in below fLeafCount++ increment
+ if (fLeafCount > std::numeric_limits<unsigned int>::max() - 1)
+ throw OutOfMemoryException();
fEOCPos = fLeafCount++;
+ // Avoid integer overflow in below memory allocatoin
Review Comment:
typo: allocation
##########
src/xercesc/validators/common/DFAContentModel.cpp:
##########
@@ -1364,14 +1372,27 @@ unsigned int
DFAContentModel::countLeafNodes(ContentSpecNode* const curNode)
if(nLoopCount!=0)
{
count += countLeafNodes(cursor);
- for(unsigned int i=0;i<nLoopCount;i++)
- count += countLeafNodes(rightNode);
+ const unsigned int countRight = countLeafNodes(rightNode);
+ // Avoid integer overflow in below multiplication
+ if (countRight > std::numeric_limits<unsigned int>::max() /
nLoopCount)
Review Comment:
In all of the following changes, just want to check as above that the limit
check should use `XMLSize_t` rather than `unsigned int`?
And would it also be possible to put brackets around all expressions being
compared for clarity?
##########
src/xercesc/validators/common/DFAContentModel.cpp:
##########
@@ -661,8 +662,15 @@ void DFAContentModel::buildDFA(ContentSpecNode* const
curNode)
// in the fLeafCount member.
//
fLeafCount=countLeafNodes(curNode);
+ // Avoid integer overflow in below fLeafCount++ increment
+ if (fLeafCount > std::numeric_limits<unsigned int>::max() - 1)
+ throw OutOfMemoryException();
fEOCPos = fLeafCount++;
+ // Avoid integer overflow in below memory allocatoin
+ if (fLeafCount > std::numeric_limits<size_t>::max() / sizeof(CMLeaf*))
Review Comment:
Should this also be `XMLSize_t`?
Would it be possible to add brackets around the division for clarity?
##########
src/xercesc/validators/common/DFAContentModel.cpp:
##########
@@ -661,8 +662,15 @@ void DFAContentModel::buildDFA(ContentSpecNode* const
curNode)
// in the fLeafCount member.
//
fLeafCount=countLeafNodes(curNode);
+ // Avoid integer overflow in below fLeafCount++ increment
+ if (fLeafCount > std::numeric_limits<unsigned int>::max() - 1)
Review Comment:
Oops, I was looking at the wrong definition in
src/xercesc/validators/common/ContentLeafNameTypeVector.hpp when I was scanning
over the `git grep` output. In that case, that all looks fine!
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