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RDMA/mlx5: Fix integer overflow while resizing CQ 

The user can provide very large cqe_size which will cause to integer
overflow as it can be seen in the following UBSAN warning:

Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Leon Romanovsky 2018-03-07 15:29:09 +02:00 committed by Doug Ledford
parent 6a21dfc0d0
commit aa0de36a40
1 changed files with 6 additions and 1 deletions
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7
drivers/infiniband/hw/mlx5/cq.c
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@ -1178,7 +1178,12 @@ static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
if (ucmd.reserved0 || ucmd.reserved1)
return -EINVAL;
umem = ib_umem_get(context, ucmd.buf_addr, entries * ucmd.cqe_size,
/* check multiplication overflow */
if (ucmd.cqe_size && SIZE_MAX / ucmd.cqe_size <= entries - 1)
return -EINVAL;
umem = ib_umem_get(context, ucmd.buf_addr,
(size_t)ucmd.cqe_size * entries,
IB_ACCESS_LOCAL_WRITE, 1);
if (IS_ERR(umem)) {
err = PTR_ERR(umem);