Thread (71 messages) 71 messages, 6 authors, 2020-11-16

Re: [PATCH RFC v2 17/21] kasan: simplify kasan_poison_kfree

From: Dmitry Vyukov <dvyukov@google.com>
Date: 2020-10-28 22:53:00
Also in: linux-mm, lkml

On Thu, Oct 22, 2020 at 3:20 PM Andrey Konovalov [off-list ref] wrote:
kasan_poison_kfree() is currently only called for mempool allocations
that are backed by either kmem_cache_alloc() or kmalloc(). Therefore, the
page passed to kasan_poison_kfree() is always PageSlab() and there's no
need to do the check.

Signed-off-by: Andrey Konovalov <redacted>
Link: https://linux-review.googlesource.com/id/If31f88726745da8744c6bea96fb32584e6c2778c
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
quoted hunk ↗ jump to hunk
---
 mm/kasan/common.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index a581937c2a44..b82dbae0c5d6 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -441,16 +441,7 @@ void __kasan_poison_kfree(void *ptr, unsigned long ip)
        struct page *page;

        page = virt_to_head_page(ptr);
-
-       if (unlikely(!PageSlab(page))) {
-               if (ptr != page_address(page)) {
-                       kasan_report_invalid_free(ptr, ip);
-                       return;
-               }
-               kasan_poison_memory(ptr, page_size(page), KASAN_FREE_PAGE);
-       } else {
-               ____kasan_slab_free(page->slab_cache, ptr, ip, false);
-       }
+       ____kasan_slab_free(page->slab_cache, ptr, ip, false);
 }

 void __kasan_kfree_large(void *ptr, unsigned long ip)
--
2.29.0.rc1.297.gfa9743e501-goog
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