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Date: Sun, 11 Feb 2018 11:28:12 +0800 From: Jason Wang <jasowang@...hat.com> To: linux-kernel@...r.kernel.org, netdev@...r.kernel.org Cc: mst@...hat.com, ebiggers3@...il.com, Jason Wang <jasowang@...hat.com> Subject: [PATCH net] ptr_ring: prevent integer overflow when calculating size Switch to use dividing to prevent integer overflow when size is too big to calculate allocation size properly. Reported-by: Eric Biggers <ebiggers3@...il.com> Fixes: 6e6e41c31122 ("ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE") Signed-off-by: Jason Wang <jasowang@...hat.com> --- include/linux/ptr_ring.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h index b884b77..e633522 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -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); } -- 2.7.4
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