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rdma: check num_sge does not exceed MAX_SGE 

rdma back-end has scatter/gather array ibv_sge[MAX_SGE=4] set
to have 4 elements. A guest could send a 'PvrdmaSqWqe' ring element
with 'num_sge' set to > MAX_SGE, which may lead to OOB access issue.
Add check to avoid it.

Reported-by: Saar Amar <saaramar5@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
This commit is contained in:
Prasad J Pandit 2018-12-13 01:00:34 +05:30 committed by Marcel Apfelbaum
parent cce648613b
commit 0e68373cc2
1 changed files with 6 additions and 6 deletions
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12
hw/rdma/rdma_backend.c
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@ -476,9 +476,9 @@ void rdma_backend_post_send(RdmaBackendDev *backend_dev,
}
pr_dbg("num_sge=%d\n", num_sge);
if (!num_sge) {
pr_dbg("num_sge=0\n");
complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_NO_SGE, ctx);
if (!num_sge || num_sge > MAX_SGE) {
pr_dbg("invalid num_sge=%d\n", num_sge);
complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_INV_NUM_SGE, ctx);
return;
}
@ -603,9 +603,9 @@ void rdma_backend_post_recv(RdmaBackendDev *backend_dev,
}
pr_dbg("num_sge=%d\n", num_sge);
if (!num_sge) {
pr_dbg("num_sge=0\n");
complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_NO_SGE, ctx);
if (!num_sge || num_sge > MAX_SGE) {
pr_dbg("invalid num_sge=%d\n", num_sge);
complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_INV_NUM_SGE, ctx);
return;
}