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ptr_ring: prevent integer overflow when calculating size
[ Upstream commit54e02162d4
] 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:6e6e41c311
("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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -450,7 +450,7 @@ static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r,
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*/
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static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp)
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{
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if (size * sizeof(void *) > KMALLOC_MAX_SIZE)
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if (size > KMALLOC_MAX_SIZE / sizeof(void *))
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return NULL;
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return kvmalloc_array(size, sizeof(void *), gfp | __GFP_ZERO);
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}
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