hohn/codeql
1
0
Fork 0
mirror of https://github.com/github/codeql.git synced 2026-04-30 03:05:15 +02:00
Code Issues Packages Projects Releases Wiki Activity

Format document

Browse Source
This commit is contained in:
Philippe Antoine
2020-08-24 13:12:54 +02:00
parent bf7e3a004e
commit 07610e0899
1 changed files with 5 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
cpp/ql/src/experimental/Likely Bugs/RedundantNullCheckParam.ql
View File

@@ -19,10 +19,7 @@ predicate blockDominates(Block check, Block access) {
}
predicate isCheckedInstruction(VariableAccess unchecked, VariableAccess checked) {
checked =
any(VariableAccess va |
va.getTarget() = unchecked.getTarget()
) and
checked = any(VariableAccess va | va.getTarget() = unchecked.getTarget()) and
//Simple test if the first access in this code path is dereferenced
not dereferenced(checked) and
blockDominates(checked.getEnclosingBlock(), unchecked.getEnclosingBlock())
@@ -38,7 +35,8 @@ predicate candidateResultChecked(VariableAccess check, EqualityOperation eqop) {
//assert macros are not taken into account
not check.isInMacroExpansion() and
// is part of a comparison against some constant NULL
eqop.getAnOperand() = check and eqop.getAnOperand() instanceof NullValue
eqop.getAnOperand() = check and
eqop.getAnOperand() instanceof NullValue
}
from VariableAccess unchecked, VariableAccess check, EqualityOperation eqop, Parameter param
@@ -54,4 +52,5 @@ where
candidateResultChecked(check, eqop) and
// and which has not been checked before in this code path
candidateResultUnchecked(unchecked)
select check, "This null check is redundant or there is a missing null check before $@ ", unchecked, "where dereferencing happens"
select check, "This null check is redundant or there is a missing null check before $@ ", unchecked,
"where dereferencing happens"