Skip to content

Fix #14891 FP knownConditionTrueFalse (dereferencing pointer to array member) #8704

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
chrchr-github wants to merge 5 commits into
base: main
Choose a base branch
from
+11 −0
Open

Fix #14891 FP knownConditionTrueFalse (dereferencing pointer to array member) #8704

Show file tree
Hide file tree
Changes from 4 commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
9549ab6
Update vf_analyzers.cpp
chrchr-github Jul 7, 2026
232bbf4
Update testvalueflow.cpp
chrchr-github Jul 7, 2026
926fe38
Update vf_analyzers.cpp [skip ci]
chrchr-github Jul 13, 2026
076bafd
Update valueflow.cpp
chrchr-github Jul 13, 2026
ccd2c28
Update valueflow.cpp
chrchr-github Jul 13, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions lib/valueflow.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3606,6 +3606,8 @@
continue;
if (tok->astOperand2()->exprId() == 0)
continue;
if (tok->astOperand2()->variable() && tok->astOperand2()->variable()->isArray() && tok->astOperand2()->variable()->getTypeName() != "std::array) // array to pointer decay

Check failure

Code scanning / Cppcheck Premium

No pair for character ("). Can't process file. File is either invalid or unicode, which is currently not supported. Error

No pair for character ("). Can't process file. File is either invalid or unicode, which is currently not supported.
Comment thread
github-advanced-security[bot] marked this conversation as resolved.
Fixed
continue;
if (!isConstExpression(tok->astOperand2(), settings.library))
continue;
if (tok->astOperand1()->valueType() && tok->astOperand2()->valueType()) {
Expand Down
9 changes: 9 additions & 0 deletions test/testvalueflow.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9092,6 +9092,15 @@ class TestValueFlow : public TestFixture {
" return x;\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, "malloc(10)", 0));

code = "struct S {\n" // #14891
" void f() const {\n"
" const int* p = a;\n"
" if (*p) {}\n"
" }\n"
" int a[3];\n"
"};\n";
ASSERT(tokenValues(code, "* p )").empty());
}

void valueFlowSymbolicIdentity()
Expand Down
Loading