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Diffstat (limited to 'mm/usercopy.c')
-rw-r--r--mm/usercopy.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/usercopy.c b/mm/usercopy.c
index cd4b41d9bf76..30a4db3cb1df 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -161,26 +161,27 @@ static inline void check_bogus_address(const unsigned long ptr, unsigned long n,
static inline void check_heap_object(const void *ptr, unsigned long n,
bool to_user)
{
+ uintptr_t addr = (uintptr_t)ptr;
struct folio *folio;
if (is_kmap_addr(ptr)) {
- unsigned long page_end = (unsigned long)ptr | (PAGE_SIZE - 1);
+ unsigned long page_end = addr | (PAGE_SIZE - 1);
- if ((unsigned long)ptr + n - 1 > page_end)
+ if (addr + n - 1 > page_end)
usercopy_abort("kmap", NULL, to_user,
offset_in_page(ptr), n);
return;
}
if (is_vmalloc_addr(ptr)) {
- struct vmap_area *area = find_vmap_area((unsigned long)ptr);
+ struct vmap_area *area = find_vmap_area(addr);
unsigned long offset;
if (!area)
usercopy_abort("vmalloc", "no area", to_user, 0, n);
- offset = (unsigned long)ptr - area->va_start;
- if ((unsigned long)ptr + n > area->va_end)
+ offset = addr - area->va_start;
+ if (addr + n > area->va_end)
usercopy_abort("vmalloc", NULL, to_user, offset, n);
return;
}