Currently, addr_has_metadata() returns true for every address. An invalid address (e.g. NULL) passed to the function when, KASAN_HW_TAGS is enabled, leads to a kernel panic.
Make addr_has_metadata() return true for valid addresses only. Note: KASAN_HW_TAGS support for vmalloc will be added with a future patch. Cc: Andrey Ryabinin <[email protected]> Cc: Alexander Potapenko <[email protected]> Cc: Dmitry Vyukov <[email protected]> Cc: Leon Romanovsky <[email protected]> Cc: Andrey Konovalov <[email protected]> Reviewed-by: Andrey Konovalov <[email protected]> Signed-off-by: Vincenzo Frascino <[email protected]> --- mm/kasan/kasan.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index cc4d9e1d49b1..8c706e7652f2 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -209,7 +209,7 @@ bool check_memory_region(unsigned long addr, size_t size, bool write, static inline bool addr_has_metadata(const void *addr) { - return true; + return (is_vmalloc_addr(addr) || virt_addr_valid(addr)); } #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ -- 2.30.0
