kunit_kfree() exists to clean up allocations from kunit_kmalloc() and
friends early instead of waiting for this to happen automatically at the
end of the test.
But it can be used on *anything* registered with the kunit resource API.
E.g. the last 2 statements are equivalent:
struct kunit_resource *res = something();
kfree(res->data);
kunit_put_resource(res);
The problem is that there could be multiple resources that point to the
same `data`.
E.g. you can have a named resource acting as a pseudo-global variable in
a test. If you point it to data allocated with kunit_kmalloc(), then
calling `kunit_kfree(ptr)` has the chance to delete either the named
resource or to kfree `ptr`.
Which one it does depends on the order the resources are registered as
kunit_kfree() will delete resources in LIFO order.
So this patch restricts kunit_kfree() to only working on resources
created by kunit_kmalloc(). Calling it is therefore guaranteed to free
the memory, not do anything else.
Note: kunit_resource_instance_match() wasn't used outside of KUnit, so
it should be safe to remove from the public interface. It's also
generally dangerous, as shown above, and shouldn't be used.
Signed-off-by: Daniel Latypov <dlatypov@xxxxxxxxxx>
---
include/kunit/resource.h | 16 ----------------
lib/kunit/kunit-test.c | 7 +++++++
lib/kunit/test.c | 10 ++++++++--
3 files changed, 15 insertions(+), 18 deletions(-)
diff --git a/include/kunit/resource.h b/include/kunit/resource.h
index 09c2b34d1c61..cf6fb8f2ac1b 100644
--- a/include/kunit/resource.h
+++ b/include/kunit/resource.h
@@ -300,22 +300,6 @@ typedef bool (*kunit_resource_match_t)(struct kunit *test,
struct kunit_resource *res,
void *match_data);
-/**
- * kunit_resource_instance_match() - Match a resource with the same instance.
- * @test: Test case to which the resource belongs.
- * @res: The resource.
- * @match_data: The resource pointer to match against.
- *
- * An instance of kunit_resource_match_t that matches a resource whose
- * allocation matches @match_data.
- */
-static inline bool kunit_resource_instance_match(struct kunit *test,
- struct kunit_resource *res,
- void *match_data)
-{
- return res->data == match_data;
-}
-
/**
* kunit_resource_name_match() - Match a resource with the same name.
* @test: Test case to which the resource belongs.
diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
index 13d0bd8b07a9..4df0335d0d06 100644
--- a/lib/kunit/kunit-test.c
+++ b/lib/kunit/kunit-test.c
@@ -161,6 +161,13 @@ static void kunit_resource_test_alloc_resource(struct kunit *test)
kunit_put_resource(res);
}
+static inline bool kunit_resource_instance_match(struct kunit *test,
+ struct kunit_resource *res,
+ void *match_data)
+{
+ return res->data == match_data;
+}
+
/*
* Note: tests below use kunit_alloc_and_get_resource(), so as a consequence
* they have a reference to the associated resource that they must release
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 0fb2771ca03e..82019a78462e 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -689,12 +689,18 @@ void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
}
EXPORT_SYMBOL_GPL(kunit_kmalloc_array);
+static inline bool kunit_kfree_match(struct kunit *test,
+ struct kunit_resource *res, void *match_data)
+{
+ /* Only match resources allocated with kunit_kmalloc() and friends. */
+ return res->free == kunit_kmalloc_array_free && res->data == match_data;
+}
+
void kunit_kfree(struct kunit *test, const void *ptr)
{
struct kunit_resource *res;
- res = kunit_find_resource(test, kunit_resource_instance_match,
- (void *)ptr);
+ res = kunit_find_resource(test, kunit_kfree_match, (void *)ptr);
/*
* Removing the resource from the list of resources drops the
--
2.37.1.359.gd136c6c3e2-goog
