Fix T47081: laplacian smooth edit mode tool crash.

2 files changed, 13 insertions, 0 deletions

diff --git a/intern/eigen/intern/linear_solver.cc b/intern/eigen/intern/linear_solver.cc
index 181b278b9c0..0fc4d39309b 100644
--- a/intern/eigen/intern/linear_solver.cc
+++ b/intern/eigen/intern/linear_solver.cc
@@ -156,6 +156,14 @@ void EIG_linear_solver_variable_lock(LinearSolver *solver, int index)
 	}
 }
 
+void EIG_linear_solver_variable_unlock(LinearSolver *solver, int index)
+{
+	if (solver->variable[index].locked) {
+		assert(solver->state == LinearSolver::STATE_VARIABLES_CONSTRUCT);
+		solver->variable[index].locked = false;
+	}
+}
+
 static void linear_solver_variables_to_vector(LinearSolver *solver)
 {
 	int num_rhs = solver->num_rhs;
@@ -269,6 +277,10 @@ void EIG_linear_solver_right_hand_side_add(LinearSolver *solver, int rhs, int in
 
 bool EIG_linear_solver_solve(LinearSolver *solver)
 {
+	/* nothing to solve, perhaps all variables were locked */
+	if (solver->m == 0 || solver->n == 0)
+		return true;
+
 	bool result = true;
 
 	assert(solver->state != LinearSolver::STATE_VARIABLES_CONSTRUCT);
diff --git a/intern/eigen/intern/linear_solver.h b/intern/eigen/intern/linear_solver.h
index 2dbea4d6f68..8f07e24e9a6 100644
--- a/intern/eigen/intern/linear_solver.h
+++ b/intern/eigen/intern/linear_solver.h
@@ -51,6 +51,7 @@ void EIG_linear_solver_delete(LinearSolver *solver);
 void EIG_linear_solver_variable_set(LinearSolver *solver, int rhs, int index, double value);
 double EIG_linear_solver_variable_get(LinearSolver *solver, int rhs, int index);
 void EIG_linear_solver_variable_lock(LinearSolver *solver, int index);
+void EIG_linear_solver_variable_unlock(LinearSolver *solver, int index);
 
 /* Matrix (A) and right hand side (b) */