From: Dan Carpenter Date: Mon, 7 Mar 2022 12:59:28 +0000 (+0300) Subject: RDMA/irdma: Prevent some integer underflows X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6f6dbb819dfc1a35bcb8b709b5c83a3ea8beff75;p=linux.git RDMA/irdma: Prevent some integer underflows My static checker complains that: drivers/infiniband/hw/irdma/ctrl.c:3605 irdma_sc_ceq_init() warn: can subtract underflow 'info->dev->hmc_fpm_misc.max_ceqs'? It appears that "info->dev->hmc_fpm_misc.max_ceqs" comes from the firmware in irdma_sc_parse_fpm_query_buf() so, yes, there is a chance that it could be zero. Even if we trust the firmware, it's easy enough to change the condition just as a hardenning measure. Fixes: 3f49d6842569 ("RDMA/irdma: Implement HW Admin Queue OPs") Link: https://lore.kernel.org/r/20220307125928.GE16710@kili Signed-off-by: Dan Carpenter Acked-by: Shiraz Saleem Signed-off-by: Jason Gunthorpe --- diff --git a/drivers/infiniband/hw/irdma/ctrl.c b/drivers/infiniband/hw/irdma/ctrl.c index 01cf75e9fd487..58c0e181ca2b8 100644 --- a/drivers/infiniband/hw/irdma/ctrl.c +++ b/drivers/infiniband/hw/irdma/ctrl.c @@ -454,7 +454,7 @@ int irdma_sc_qp_create(struct irdma_sc_qp *qp, struct irdma_create_qp_info *info cqp = qp->dev->cqp; if (qp->qp_uk.qp_id < cqp->dev->hw_attrs.min_hw_qp_id || - qp->qp_uk.qp_id > (cqp->dev->hmc_info->hmc_obj[IRDMA_HMC_IW_QP].max_cnt - 1)) + qp->qp_uk.qp_id >= cqp->dev->hmc_info->hmc_obj[IRDMA_HMC_IW_QP].max_cnt) return -EINVAL; wqe = irdma_sc_cqp_get_next_send_wqe(cqp, scratch); @@ -2504,10 +2504,10 @@ static int irdma_sc_cq_create(struct irdma_sc_cq *cq, u64 scratch, int ret_code = 0; cqp = cq->dev->cqp; - if (cq->cq_uk.cq_id > (cqp->dev->hmc_info->hmc_obj[IRDMA_HMC_IW_CQ].max_cnt - 1)) + if (cq->cq_uk.cq_id >= cqp->dev->hmc_info->hmc_obj[IRDMA_HMC_IW_CQ].max_cnt) return -EINVAL; - if (cq->ceq_id > (cq->dev->hmc_fpm_misc.max_ceqs - 1)) + if (cq->ceq_id >= cq->dev->hmc_fpm_misc.max_ceqs) return -EINVAL; ceq = cq->dev->ceq[cq->ceq_id]; @@ -3602,7 +3602,7 @@ int irdma_sc_ceq_init(struct irdma_sc_ceq *ceq, info->elem_cnt > info->dev->hw_attrs.max_hw_ceq_size) return -EINVAL; - if (info->ceq_id > (info->dev->hmc_fpm_misc.max_ceqs - 1)) + if (info->ceq_id >= info->dev->hmc_fpm_misc.max_ceqs) return -EINVAL; pble_obj_cnt = info->dev->hmc_info->hmc_obj[IRDMA_HMC_IW_PBLE].cnt; @@ -4148,7 +4148,7 @@ int irdma_sc_ccq_init(struct irdma_sc_cq *cq, struct irdma_ccq_init_info *info) info->num_elem > info->dev->hw_attrs.uk_attrs.max_hw_cq_size) return -EINVAL; - if (info->ceq_id > (info->dev->hmc_fpm_misc.max_ceqs - 1)) + if (info->ceq_id >= info->dev->hmc_fpm_misc.max_ceqs) return -EINVAL; pble_obj_cnt = info->dev->hmc_info->hmc_obj[IRDMA_HMC_IW_PBLE].cnt;