Commit c75d3ec8 authored by Amrani, Ram's avatar Amrani, Ram Committed by Doug Ledford
Browse files

RDMA/qedr: Prevent memory overrun in verbs' user responses

Wrap ib_copy_to_udata with a function that ensures that the data
being copied over to user space isn't longer than the allowed.

Fixes: cecbcddf ("qedr: Add support for QP verbs")
Fixes: a7efd777 ("qedr: Add support for PD,PKEY and CQ verbs")
Fixes: ac1b36e5

 ("qedr: Add support for user context verbs")
Signed-off-by: default avatarRam Amrani <Ram.Amrani@cavium.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 720336c4
......@@ -53,6 +53,14 @@
#define DB_ADDR_SHIFT(addr) ((addr) << DB_PWM_ADDR_OFFSET_SHIFT)
static inline int qedr_ib_copy_to_udata(struct ib_udata *udata, void *src,
size_t len)
{
size_t min_len = min_t(size_t, len, udata->outlen);
return ib_copy_to_udata(udata, src, min_len);
}
int qedr_query_pkey(struct ib_device *ibdev, u8 port, u16 index, u16 *pkey)
{
if (index > QEDR_ROCE_PKEY_TABLE_LEN)
......@@ -378,7 +386,7 @@ struct ib_ucontext *qedr_alloc_ucontext(struct ib_device *ibdev,
uresp.sges_per_srq_wr = dev->attr.max_srq_sge;
uresp.max_cqes = QEDR_MAX_CQES;
rc = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
rc = qedr_ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rc)
goto err;
......@@ -499,7 +507,7 @@ struct ib_pd *qedr_alloc_pd(struct ib_device *ibdev,
uresp.pd_id = pd_id;
rc = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
rc = qedr_ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rc) {
DP_ERR(dev, "copy error pd_id=0x%x.\n", pd_id);
dev->ops->rdma_dealloc_pd(dev->rdma_ctx, pd_id);
......@@ -729,7 +737,7 @@ static int qedr_copy_cq_uresp(struct qedr_dev *dev,
uresp.db_offset = DB_ADDR_SHIFT(DQ_PWM_OFFSET_UCM_RDMA_CQ_CONS_32BIT);
uresp.icid = cq->icid;
rc = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
rc = qedr_ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rc)
DP_ERR(dev, "copy error cqid=0x%x.\n", cq->icid);
......@@ -1238,7 +1246,7 @@ static int qedr_copy_qp_uresp(struct qedr_dev *dev,
uresp.atomic_supported = dev->atomic_cap != IB_ATOMIC_NONE;
uresp.qp_id = qp->qp_id;
rc = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
rc = qedr_ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rc)
DP_ERR(dev,
"create qp: failed a copy to user space with qp icid=0x%x.\n",
......
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