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Subject[PATCH mm v2 01/33] kasan: check KASAN_NO_FREE_META in __kasan_metadata_size
Date
From: Andrey Konovalov <andreyknvl@google.com>

__kasan_metadata_size() calculates the size of the redzone for objects
in a slab cache.

When accounting for presence of kasan_free_meta in the redzone, this
function only compares free_meta_offset with 0. But free_meta_offset could
also be equal to KASAN_NO_FREE_META, which indicates that kasan_free_meta
is not present at all.

Add a comparison with KASAN_NO_FREE_META into __kasan_metadata_size().

Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

---

This is a minor fix that only affects slub_debug runs, so it is probably
not worth backporting.
---
mm/kasan/common.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 707c3a527fcb..b7351b860abf 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -223,8 +223,9 @@ size_t __kasan_metadata_size(struct kmem_cache *cache)
return 0;
return (cache->kasan_info.alloc_meta_offset ?
sizeof(struct kasan_alloc_meta) : 0) +
- (cache->kasan_info.free_meta_offset ?
- sizeof(struct kasan_free_meta) : 0);
+ ((cache->kasan_info.free_meta_offset &&
+ cache->kasan_info.free_meta_offset != KASAN_NO_FREE_META) ?
+ sizeof(struct kasan_free_meta) : 0);
}

struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
--
2.25.1
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