Commit Graph

217 Commits

Author SHA1 Message Date
Paul Fultz II 0ecac8e23b
Fix issue 10090: ValueFlow: Wrong lifetime, pointer member is not allocated on stack (#3109) 2021-02-03 10:22:31 +01:00
Daniel Marjamäki bf236e91d7 Fixed #9918 (False positive: autoVariable pointer is NULLed later) 2020-09-28 22:48:57 +02:00
Paul Fultz II 857722f859
Fix issue 9711: FP knownConditionTrueFalse for variable modified via pointer (#2813) 2020-09-20 14:27:09 +02:00
Paul Fultz II 34d65e25d6
Merge branch 'main' into lifetime-subfunction 2020-09-09 12:02:02 -05:00
Paul 8d7088aa24 Fix issue 9835: False negative: Return reference to temporary with const reference 2020-09-08 18:30:45 -05:00
Paul 1be67ea008 Merge 2020-09-08 11:00:57 -05:00
Paul Fultz II 362ab44c40
Fix issue 9646: False negative: Return reference to temporary with const reference (#2782) 2020-09-07 10:52:54 +02:00
Paul 786672e19d Format 2020-09-06 21:59:21 -05:00
Paul c7a5d3c5f1 Fix FPs 2020-09-06 21:58:36 -05:00
Paul 264c0cae8b Formatting 2020-09-04 11:59:30 -05:00
Paul bb37b07def Extend lifetimes to subfunctions 2020-09-04 11:56:34 -05:00
Paul Fultz II 0a718694af
Fix issue 9852: False positive: danglingTemporaryLifetime when returning a vector of vectors (#2766) 2020-09-01 11:21:29 +02:00
Paul e2a81a382f Track reading aliases during valueflow forward 2020-07-19 23:25:35 -05:00
Paul Fultz II eb4754b7d9
Fix issue 9587: False positive: parameter can be declared with const (#2667) 2020-05-31 10:10:10 +02:00
Oliver Stöneberg 37bc0483a4
made check.h less heavy (#2633) 2020-05-23 07:16:49 +02:00
Daniel Marjamäki 08ddd84780 Update copyright year 2020-05-10 11:16:32 +02:00
Daniel Marjamäki 3e0218299b Revert "Update copyright year"
This reverts commit 6eec6c4bd5.
2020-05-10 11:13:05 +02:00
Daniel Marjamäki 6eec6c4bd5 Update copyright year 2020-05-10 11:11:34 +02:00
Paul Fultz II 453a69dd8c
Fix issue 9677: False positive: returning pointer to oject that will not be invalid (#2607)
* Fix issue 9677: False positive: returning pointer to oject that will not be invalid

* Formatting
2020-04-18 09:23:10 +02:00
orbitcowboy acdc62f8f0 Formatted the code. There are no functional changes [ci skip] 2020-03-26 17:03:21 +01:00
Paul Fultz II 5462e43161
Fix issue 9639: False positive: Returning object that points to local variable that will be invalid when returning (#2576)
* Follow reference when tracking local variables

* Fix issue 9639: False positive: Returning object that points to local variable that will be invalid when returning
2020-03-23 22:54:53 +01:00
Daniel Marjamäki a5a294cf13 Code cleanup 2020-01-25 18:11:54 +01:00
Daniel Marjamäki f911495db3 Clang import; Handle clang-9 while loop better 2020-01-25 16:10:13 +01:00
Daniel Marjamäki 7db54bde6f Run normal checks on --clang output 2020-01-24 18:04:39 +01:00
Paul Fultz II d1f225b8ee Fix issue 9201: FP: returnDanglingLifetime on pointer to variable of static struct (#2303)
* Fix issue 9201: FP: returnDanglingLifetime on pointer to variable of static struct

* Fix capture of non-local variables in lambdas
2019-11-05 07:10:32 +01:00
Paul Fultz II c38bbb75e4 Fix issue 9448: Check for temporaries from library function calls (#2312) 2019-11-03 22:02:10 +01:00
Paul Fultz II 4eb4762d95 Extend lifetime checking to temporaries (#2242)
* Use lifetimes to check for returning reference to temporaries

* Check for dangling temporaries

* Check for unknown types for returining by reference

* Remove old returnTemporary check

* Format

* Check for deref op

* Ternary operator return an lvalue reference

* Warn when returning temporaries from member functions

* Improve handling of pointer to function

* Extend lifetimes of const references
2019-10-08 09:28:39 +02:00
Paul Fultz II ba037837c9 Track lifetime across multiple returns
This will now warn when doing something like this:

```cpp
template <class T, class K, class V>
const V& get_default(const T& t, const K& k, const V& v) {
    auto it = t.find(k);
    if (it == t.end()) return v;
    return it->second;
}
const int& bar(const std::unordered_map<int, int>& m, int k) {
    auto x = 0;
    return get_default(m, k, x);
}
```

The lifetime warning is considered inconclusive in this case.

I also updated valueflow to no tinject inconclusive values unless `--inconclusive` flag is passed. This creates some false negatives because library functions are not configured to not modify their input parameters, and there are some checks that do not check if the value is inconclusive or not.
2019-09-11 19:25:09 +02:00
Paul Fultz II 4f76588f98 Fix issue 9275: False positive: Non-local object uses local variable (#2084) 2019-08-14 20:09:33 +02:00
Paul Fultz II a08a9c1349 Switch to use lifetime analysis for iterators and pointers to invalid containers
This will diagnose more issues such as:

```cpp
void f(std::vector<int> &v) {
    auto v0 = v.begin();
    v.push_back(123);
    std::cout << *v0 << std::endl;
}
```
2019-07-18 10:56:44 +02:00
Daniel Marjamäki 32eda27391 Refactoring: Use enum class 2019-07-16 10:51:26 +02:00
Daniel Marjamäki 5175bda774 Use 'nonneg' instead of 'unsigned' in checkautovariables 2019-07-15 13:33:29 +02:00
Paul Fultz II b0d10273ed Fix issue 3695: Handle class pointers
This switches to use lifetime analysis to check for assigning to non-local variables:

```cpp
class test
{
public:

  void f()
  {
    int x;
    this->ptr = &x;
  }

protected:
  int *ptr;
};
```
2019-07-07 10:16:19 +02:00
Rikard Falkeborn 839fcddd8a Fix #6115 (Add support to realloc to cfg files) (#1953)
* Allow to configure realloc like functions

* memleakonrealloc: Bring back tests.

The old memleak checker was removed, and the tests for it was removed in
commit 9765a2dfab. This also removed the
tests for memleakOnRealloc. Bring back those tests, somewhat modified
since the checker no longer checks for memory leaks.

* Add realloc to mem leak check

* Add tests of realloc buffer size

* Configure realloc functions

* Add test of freopen

* Allow to configure which element is realloc argument

* Fix wrong close in test

cppcheck now warns for this

* Update manual

* Update docs

* Rename alloc/dalloc/realloc functions

Naming the member function realloc caused problems on appveyor. Rename
the alloc and dealloc functions as well for consistency.

* Change comparisson order

* Remove variable and use function call directly

* Create temporary variable to simplify

* Throw mismatchError on mismatching allocation/reallocation

* Refactor to separate function

* Fix potential nullptr dereference

As pointed out by cppcheck.
2019-07-05 12:44:52 +02:00
Paul Fultz II 8a1c0dd017 Fix FP with non-local variable referencing a non-local variable (#1864) 2019-06-02 10:21:26 +02:00
Paul Fultz II f75c15af56 Fix issue 6821: New check: access heap/stack data using address of variable
This fixes errors with:

```cpp
int f() {
    int i;
    return (&i)[1];
}
```

It uses the lifetime analysis to detect the issues.
2019-05-31 12:24:31 +02:00
Paul Fultz II 8c03be3212 Fix issue 9077: False positive: Returning pointer to local variable (#1821)
* Avoid implicit conversion for lifetimes

* Fix issue 9077

* Add more tests

* Rename function

* Fix implicit conversion with containers

* Format

* Fix crash
2019-05-05 11:40:59 +02:00
Paul Fultz II 774464eabb Fix issue 8996: False positive duplicateCondition
This fixes issue 8996 by improving the alias checking by using lifetime analysis. It also extends the lifetime checker to handle constructors and initializer lists for containers and arrays.
2019-03-19 06:25:10 +01:00
Daniel Marjamäki 92485245ce Restore severity for 'autoVariables' 2019-03-15 15:13:11 +01:00
Daniel Marjamäki 3656f1ae4f Auto variables: Fix false negatives for normal tokens 2019-03-14 13:51:35 +01:00
Daniel Marjamäki 6eeee743d2 Auto variables: Minor cleanup 2019-03-14 06:41:11 +01:00
Daniel Marjamäki e17ddfd964 Changed AST for variable declarations with initializations 2019-03-09 19:09:15 +01:00
Paul Fultz II 507c7a4388 Improvement to lifetime tracking of addressof and derefencing
This will now warn for cases like this:

```cpp
auto& f() {
    std::vector<int> x;
    return x[0];
}
```

It also improves the handling of address of operator, so it can now warn across some function calls, like this:

```cpp
int& f(int& a) {
    return a;
}
int* hello() {
    int x = 0;
    return &f(x);
}
```
2019-02-22 06:38:56 +01:00
Kamil Dudka 2908593cf6 checkautovariables: eliminate false positives on assignment of &ptr->item (#1667)
Even if `ptr` is a local variable, the object `ptr->item` might be not.
So taking address of `ptr->item` is definitely not unsafe in general.

This commit fixes false positives triggered by commit
1.85-249-gf42648fe2 on the following code of sssd:

https://github.com/SSSD/sssd/blob/d409df33/src/sbus/request/sbus_request.c#L359
2019-02-18 09:35:07 +01:00
Daniel Marjamäki bd7790fd8c Update copyright year 2019-02-09 07:24:06 +01:00
Paul Fultz II 165a22ed0f Lifetime: Support analysis with functions that do not return a reference (#1632)
* Initial support for function return

* Add test case

* Add support for reference parameters

* Format
2019-01-29 09:47:52 +01:00
Paul Fultz II d6aaf401df Lifetime: Follow functions that return references
This will now warn for cases like this:

```cpp
int& f(int& a) {
    return a;
}
int& hello() {
    int x = 0;
    return f(x);
}
```
2019-01-26 11:03:57 +01:00
Paul Fultz II 3975913637 Extend lifetime checking for references
This will use the lifetime checker for dangling references. It will find these cases for indirectly assigned reference:

```cpp
int &foo()
{
    int s = 0;
    int& x = s;
    return x;
}
```

This will also fix issue 510 as well:

```cpp
int &f( int k )
{
    static int &r = k;
    return r;
}
```
2019-01-23 07:29:16 +01:00
versat 991191450a astyle formatting
[ci skip]
2019-01-11 12:56:31 +01:00
Paul Fultz II 921f6e4313 Fix issue 8883: False positive: returnDanglingLifetime with local struct or class (#1585) 2019-01-11 09:51:02 +01:00