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SelfAssignment.ql

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codeql-cli/v2.27.2

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SelfAssignment.ql

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/**

* @name Self assignment

* @description Assigning a variable to itself has no effect.

* @kind problem

* @problem.severity warning

* @id go/redundant-assignment

* @tags quality

* reliability

* correctness

* external/cwe/cwe-480

* external/cwe/cwe-561

* @precision high

*/

import Clones

/**

* An assignment that may be a self assignment.

*/

class PotentialSelfAssignment extends HashRoot, AssignStmt {

PotentialSelfAssignment() { this.getLhs().getKind() = this.getRhs().getKind() }

}

from PotentialSelfAssignment assgn, HashableNode rhs

where

rhs = assgn.getRhs() and

rhs.hash() = assgn.getLhs().(HashableNode).hash()

select assgn, "This statement assigns an $@ to itself.", rhs, "expression"