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authorAndrey Konovalov <andreyknvl@google.com>2023-12-20 01:28:52 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-12-29 22:58:38 +0300
commitcf0da2afe3dc2462b07fc951fa335a318eb38775 (patch)
tree90279508328ff1703daa845de776280a85864577 /mm/kasan/common.c
parent9f41c59ae3163690868a32bd77e9e33c3bab555e (diff)
downloadlinux-cf0da2afe3dc2462b07fc951fa335a318eb38775.tar.xz
kasan: clean up __kasan_mempool_poison_object
Reorganize the code and reword the comment in __kasan_mempool_poison_object to improve the code readability. Link: https://lkml.kernel.org/r/4f6fc8840512286c1a96e16e86901082c671677d.1703024586.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Cc: Alexander Lobakin <alobakin@pm.me> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Breno Leitao <leitao@debian.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan/common.c')
-rw-r--r--mm/kasan/common.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 7ebc001d0fcd..3f4a1ed69e03 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -457,27 +457,22 @@ void __kasan_mempool_unpoison_pages(struct page *page, unsigned int order,
bool __kasan_mempool_poison_object(void *ptr, unsigned long ip)
{
- struct folio *folio;
-
- folio = virt_to_folio(ptr);
+ struct folio *folio = virt_to_folio(ptr);
+ struct slab *slab;
/*
- * Even though this function is only called for kmem_cache_alloc and
- * kmalloc backed mempool allocations, those allocations can still be
- * !PageSlab() when the size provided to kmalloc is larger than
- * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc.
+ * This function can be called for large kmalloc allocation that get
+ * their memory from page_alloc. Thus, the folio might not be a slab.
*/
if (unlikely(!folio_test_slab(folio))) {
if (check_page_allocation(ptr, ip))
return false;
kasan_poison(ptr, folio_size(folio), KASAN_PAGE_FREE, false);
return true;
- } else {
- struct slab *slab = folio_slab(folio);
-
- return !____kasan_slab_free(slab->slab_cache, ptr, ip,
- false, false);
}
+
+ slab = folio_slab(folio);
+ return !____kasan_slab_free(slab->slab_cache, ptr, ip, false, false);
}
void __kasan_mempool_unpoison_object(void *ptr, size_t size, unsigned long ip)