Avoid potential buffer over-read in shader, overrun in application.

Author: Shyotl

indra/newview/app_settings/shaders/class1/avatar/objectSkinV.glsl

@@ -34,7 +34,7 @@ mat4 getObjectSkinnedTransform()
 	vec4 w = fract(weight4);
 	vec4 index = floor(weight4);
 
-		 index = min(index, vec4(63.0));
+		 index = min(index, vec4(51.0));
 		 index = max(index, vec4( 0.0));
 
 	float scale = 1.0/(w.x+w.y+w.z+w.w);

indra/newview/lldrawpoolavatar.cpp

@@ -1570,7 +1570,9 @@ void LLDrawPoolAvatar::updateRiggedFaceVertexBuffer(LLVOAvatar* avatar, LLFace*
 		LLMatrix4a mp[JOINT_COUNT];
 		LLMatrix4* mat = (LLMatrix4*) mp;
 
-		for (U32 j = 0; j < skin->mJointNames.size(); ++j)
+		U32 count = llmin((U32) skin->mJointNames.size(), (U32) JOINT_COUNT);
+
+		for (U32 j = 0; j < count; ++j)
 		{
 			LLJoint* joint = avatar->getJoint(skin->mJointNames[j]);
 			if (joint)