ptr_ring: prevent integer overflow when calculating size
authorJason Wang <jasowang@redhat.com>
Sun, 11 Feb 2018 03:28:12 +0000 (11:28 +0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 12 Feb 2018 03:33:22 +0000 (22:33 -0500)
Switch to use dividing to prevent integer overflow when size is too
big to calculate allocation size properly.

Reported-by: Eric Biggers <ebiggers3@gmail.com>
Fixes: 6e6e41c31122 ("ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/linux/ptr_ring.h

index b884b77..e633522 100644 (file)
@@ -469,7 +469,7 @@ static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r,
  */
 static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp)
 {
-       if (size * sizeof(void *) > KMALLOC_MAX_SIZE)
+       if (size > KMALLOC_MAX_SIZE / sizeof(void *))
                return NULL;
        return kvmalloc_array(size, sizeof(void *), gfp | __GFP_ZERO);
 }