Messages in this thread Patch in this message | | | From | Andrey Konovalov <> | Subject | [PATCH 1/2] kasan: fix invalid-free test crashing the kernel | Date | Thu, 1 Mar 2018 18:15:42 +0100 |
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When an invalid-free is triggered by one of the KASAN tests, the object doesn't actually get freed. This later leads to a BUG failure in kmem_cache_destroy that checks that there are no allocated objects in the cache that is being destroyed. Fix this by calling kmem_cache_free with the proper object address after the call that triggers invalid-free.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- lib/test_kasan.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 98854a64b014..ec657105edbf 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -567,7 +567,15 @@ static noinline void __init kmem_cache_invalid_free(void) return; } + /* Trigger invalid free, the object doesn't get freed */ kmem_cache_free(cache, p + 1); + + /* + * Properly free the object to prevent the "Objects remaining in + * test_cache on __kmem_cache_shutdown" BUG failure. + */ + kmem_cache_free(cache, p); + kmem_cache_destroy(cache); } -- 2.16.2.395.g2e18187dfd-goog
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