Fix additional overflow and underflow issues with line loops.

src/common/version.h

 #define MAJOR_VERSION 1
 #define MINOR_VERSION 0
 #define BUILD_VERSION 0
-#define BUILD_REVISION 2254
+#define BUILD_REVISION 2255
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/libGLESv2/Context.cpp

@@ -3253,11 +3253,14 @@ void Context::drawLineLoop(GLsizei count, GLenum type, const GLvoid *indices, in
 
     if (supports32bitIndices())
     {
-        if (static_cast<unsigned int>(count + 1) > (std::numeric_limits<unsigned int>::max() / sizeof(unsigned int)))
+        // Verified by the glDraw* functions
+        ASSERT(count >= 0);
+
+        if (static_cast<unsigned int>(count) + 1 > (std::numeric_limits<unsigned int>::max() / sizeof(unsigned int)))
         {
             return error(GL_OUT_OF_MEMORY);
         }
-        const unsigned int spaceNeeded = (count + 1) * sizeof(unsigned int);
+        const unsigned int spaceNeeded = (static_cast<unsigned int>(count) + 1) * sizeof(unsigned int);
 
         if (!mLineLoopIB)
         {
@@ -3314,11 +3317,14 @@ void Context::drawLineLoop(GLsizei count, GLenum type, const GLvoid *indices, in
     }
     else
     {
-        if (static_cast<unsigned short>(count + 1) > (std::numeric_limits<unsigned short>::max() / sizeof(unsigned short)))
+        // Verified by the glDraw* functions
+        ASSERT(count >= 0);
+
+        if (static_cast<unsigned short>(count) + 1 > (std::numeric_limits<unsigned short>::max() / sizeof(unsigned short)))
         {
             return error(GL_OUT_OF_MEMORY);
         }
-        const unsigned int spaceNeeded = (count + 1) * sizeof(unsigned short);
+        const unsigned int spaceNeeded = (static_cast<unsigned short>(count) + 1) * sizeof(unsigned short);
 
         if (!mLineLoopIB)
         {