kasan: use virt_addr_valid in kasan_addr_to_page/slab

Instead of open-coding the validity checks for addr in
kasan_addr_to_page/slab(), use the virt_addr_valid() helper.

Link: https://lkml.kernel.org/r/c22a4850d74d7430f8a6c08216fd55c2860a2b9e.1662411799.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 83f420a..570f941 100644 (file)
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -208,14 +208,14 @@ static void print_track(struct kasan_track *track, const char *prefix)
 
 struct page *kasan_addr_to_page(const void *addr)
 {
-       if ((addr >= (void *)PAGE_OFFSET) && (addr < high_memory))
+       if (virt_addr_valid(addr))
                return virt_to_head_page(addr);
        return NULL;
 }
 
 struct slab *kasan_addr_to_slab(const void *addr)
 {
-       if ((addr >= (void *)PAGE_OFFSET) && (addr < high_memory))
+       if (virt_addr_valid(addr))
                return virt_to_slab(addr);
        return NULL;
 }