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authorDan Sinclair <dsinclair@chromium.org>2018-03-28 13:20:09 +0000
committerChromium commit bot <commit-bot@chromium.org>2018-03-28 13:20:09 +0000
commit8eac5ad73918818569859cd0453a1d5a44a1f81b (patch)
treed3a6bd4d76935662531512da5c65837d563d65dd /xfa/fxfa/fm2js
parente6ce3428fce89f17e2e416adc567a401901f340b (diff)
downloadpdfium-8eac5ad73918818569859cd0453a1d5a44a1f81b.tar.xz
Smaller post expression set
This CL decreases the kMaxPostExpressions to 256. This is the number of accessors you can attach to a single statement (e.g. foo.#A.#A.#A). Having a very large number can cause stack overflows. The accessor does not seem like it would expect hundreds of entries on a single element. Bug: chromium:820688 Change-Id: I19966b43c96f5d1d02a79af127a0c96609420811 Reviewed-on: https://pdfium-review.googlesource.com/29330 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
Diffstat (limited to 'xfa/fxfa/fm2js')
-rw-r--r--xfa/fxfa/fm2js/cxfa_fmparser.cpp11
1 files changed, 8 insertions, 3 deletions
diff --git a/xfa/fxfa/fm2js/cxfa_fmparser.cpp b/xfa/fxfa/fm2js/cxfa_fmparser.cpp
index 5079ab110e..dca427a20a 100644
--- a/xfa/fxfa/fm2js/cxfa_fmparser.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmparser.cpp
@@ -16,7 +16,7 @@
namespace {
constexpr unsigned int kMaxParseDepth = 1250;
-constexpr unsigned int kMaxPostExpressions = 16384;
+constexpr unsigned int kMaxPostExpressions = 256;
} // namespace
@@ -688,6 +688,7 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
case TOKlparen: {
if (!NextToken())
return nullptr;
+
std::vector<std::unique_ptr<CXFA_FMSimpleExpression>> expressions;
if (m_token.m_type != TOKrparen) {
while (m_token.m_type != TOKrparen) {
@@ -789,7 +790,8 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
std::move(expr), TOKdot, tempStr, std::move(s));
continue;
}
- } break;
+ break;
+ }
case TOKdotdot: {
if (!NextToken())
return nullptr;
@@ -814,7 +816,8 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
std::move(expr), TOKdotdot, tempStr, std::move(s));
continue;
}
- } break;
+ break;
+ }
case TOKdotscream: {
if (!NextToken())
return nullptr;
@@ -824,6 +827,7 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
WideStringView tempStr = m_token.m_string;
if (!NextToken())
return nullptr;
+
if (m_token.m_type != TOKlbracket) {
std::unique_ptr<CXFA_FMSimpleExpression> s =
pdfium::MakeUnique<CXFA_FMIndexExpression>(ACCESSOR_NO_INDEX,
@@ -832,6 +836,7 @@ std::unique_ptr<CXFA_FMSimpleExpression> CXFA_FMParser::ParsePostExpression(
std::move(expr), TOKdotscream, tempStr, std::move(s));
continue;
}
+
std::unique_ptr<CXFA_FMSimpleExpression> s = ParseIndexExpression();
if (!s)
return nullptr;