Fixed potential buffer corruption in toString of serveral AST (#345)

* fix toString function defect * address dangleptr's comments * address dutor's comments
vesoft-inc · May 13, 2019 · cba6eed · cba6eed
1 parent 344cd0c
commit cba6eed
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Showing 4 changed files with 53 additions and 20 deletions.
diff --git a/src/parser/AdminSentences.cpp b/src/parser/AdminSentences.cpp
@@ -37,7 +37,9 @@ std::string HostList::toString() const {
         buf += std::to_string(host->second);
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -82,7 +84,9 @@ std::string SpaceOptList::toString() const {
         buf += item->toString();
         buf += ",";
     }
-    buf.resize(buf.size()-1);
+    if (!buf.empty()) {
+        buf.resize(buf.size()-1);
+    }
     return buf;
 }
 

diff --git a/src/parser/Clauses.cpp b/src/parser/Clauses.cpp
@@ -28,7 +28,9 @@ std::string SourceNodeList::toString() const {
         buf += std::to_string(id);
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -80,7 +82,9 @@ std::string YieldColumns::toString() const {
         }
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 

diff --git a/src/parser/MaintainSentences.cpp b/src/parser/MaintainSentences.cpp
@@ -15,7 +15,8 @@ std::string CreateTagSentence::toString() const {
     buf += "CREATE TAG ";
     buf += *name_;
     buf += " (";
-    for (auto *col : columns_->columnSpecs()) {
+    auto colSpecs = std::move(columns_->columnSpecs());
+    for (auto *col : colSpecs) {
         buf += *col->name();
         buf += " ";
         buf += columnTypeToString(col->type());
@@ -25,7 +26,9 @@ std::string CreateTagSentence::toString() const {
         }
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!colSpecs.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     buf += ")";
     return buf;
 }
@@ -37,7 +40,8 @@ std::string CreateEdgeSentence::toString() const {
     buf += "CREATE EDGE ";
     buf += *name_;
     buf += " (";
-    for (auto &col : columns_->columnSpecs()) {
+    auto colSpecs = std::move(columns_->columnSpecs());
+    for (auto &col : colSpecs) {
         buf += *col->name();
         buf += " ";
         buf += columnTypeToString(col->type());
@@ -47,7 +51,9 @@ std::string CreateEdgeSentence::toString() const {
         }
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!colSpecs.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     buf += ")";
     return buf;
 }
@@ -58,7 +64,8 @@ std::string AlterTagOptItem::toString() const {
     buf.reserve(256);
     buf += getOptTypeStr();
     buf += " (";
-    for (auto &col : columns_->columnSpecs()) {
+    auto colSpecs = std::move(columns_->columnSpecs());
+    for (auto &col : colSpecs) {
         buf += *col->name();
         buf += " ";
         buf += columnTypeToString(col->type());
@@ -68,7 +75,9 @@ std::string AlterTagOptItem::toString() const {
         }
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!colSpecs.empty()) {
+       buf.resize(buf.size() - 1);
+    }
     buf += ")";
     return buf;
 }
@@ -106,7 +115,8 @@ std::string AlterEdgeSentence::toString() const {
     buf += "ALTER EDGE ";
     buf += *name_;
     buf += "(";
-    for (auto &col : columns_->columnSpecs()) {
+    auto colSpecs = std::move(columns_->columnSpecs());
+    for (auto &col : colSpecs) {
         buf += *col->name();
         buf += " ";
         buf += columnTypeToString(col->type());
@@ -116,7 +126,9 @@ std::string AlterEdgeSentence::toString() const {
         }
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!colSpecs.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     buf += ")";
     return buf;
 }

diff --git a/src/parser/MutateSentences.cpp b/src/parser/MutateSentences.cpp
@@ -15,7 +15,9 @@ std::string PropertyList::toString() const {
         buf += *prop;
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -43,8 +45,9 @@ std::string VertexTagList::toString() const {
         buf += item->toString();
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
-
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -56,7 +59,9 @@ std::string ValueList::toString() const {
         buf += expr->toString();
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -80,7 +85,9 @@ std::string VertexRowList::toString() const {
         buf += item->toString();
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -123,7 +130,9 @@ std::string EdgeRowList::toString() const {
         buf += item->toString();
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -161,7 +170,9 @@ std::string UpdateList::toString() const {
         buf += item->toString();
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }
 
@@ -236,7 +247,9 @@ std::string EdgeList::toString() const {
         buf += std::to_string(edge.second);
         buf += ",";
     }
-    buf.resize(buf.size() - 1);
+    if (!buf.empty()) {
+        buf.resize(buf.size() - 1);
+    }
     return buf;
 }