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add fallback if I can't easily determine the variable

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erik-krogh
2024-04-05 16:18:20 +02:00
parent 8b220cc1b3
commit ca4f667053
3 changed files with 24 additions and 10 deletions
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20
java/ql/src/Likely Bugs/Arithmetic/InformationLoss.ql
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@@ -27,17 +27,23 @@ class DangerousAssignOpExpr extends AssignOp {
predicate problematicCasting(Type t, Expr e) { e.getType().(NumType).widerThan(t) }
Variable getVariable(DangerousAssignOpExpr a) {
result = a.getDest().(VarAccess).getVariable()
Variable getVariable(Expr dest) {
result = dest.(VarAccess).getVariable()
or
result = a.getDest().(ArrayAccess).getArray().(VarAccess).getVariable()
result = dest.(ArrayAccess).getArray().(VarAccess).getVariable()
}
from DangerousAssignOpExpr a, Expr e, Variable v
from DangerousAssignOpExpr a, Expr e, Top v
where
e = a.getSource() and
problematicCasting(a.getDest().getType(), e) and
v = getVariable(a)
(
v = getVariable(a.getDest())
or
// fallback, in case we can't easily determine the variable
not exists(getVariable(a.getDest())) and
v = a.getDest()
)
select a,
"Implicit cast of source $@ to narrower destination type " + a.getDest().getType().getName() + ".",
v, "type " + e.getType().getName()
"Implicit cast of $@ to narrower destination type " + a.getDest().getType().getName() + ".",
v, "source type " + e.getType().getName()