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e562e309d1
kunit_kfree() can only work on data ("resources") allocated by KUnit.
Currently for code like this,
> void *ptr = kmalloc(4, GFP_KERNEL);
> kunit_kfree(test, ptr);
kunit_kfree() will segfault.
It'll try and look up the kunit_resource associated with `ptr` and get a
NULL back, but it won't check for this. This means we also segfault if
you double-free.
Change kunit_kfree() so it'll notice these invalid pointers and respond
by failing the test.
Implementation: kunit_destroy_resource() does what kunit_kfree() does,
but is more generic and returns -ENOENT when it can't find the resource.
Sadly, unlike just letting it crash, this means we don't get a stack
trace. But kunit_kfree() is so infrequently used it shouldn't be hard to
track down the bad callsite anyways.
After this change, the above code gives:
> # example_simple_test: EXPECTATION FAILED at lib/kunit/test.c:702
> kunit_kfree: 00000000626ec200 already freed or not allocated by kunit
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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| .. | ||
| .kunitconfig | ||
| assert.c | ||
| debugfs.c | ||
| debugfs.h | ||
| executor.c | ||
| executor_test.c | ||
| Kconfig | ||
| kunit-example-test.c | ||
| kunit-test.c | ||
| Makefile | ||
| resource.c | ||
| string-stream-test.c | ||
| string-stream.c | ||
| string-stream.h | ||
| test.c | ||
| try-catch-impl.h | ||
| try-catch.c | ||