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authorPrasad J Pandit <pjp@fedoraproject.org>2018-12-13 01:00:34 +0530
committerMarcel Apfelbaum <marcel.apfelbaum@gmail.com>2018-12-22 11:09:57 +0200
commit0e68373cc2b3a063ce067bc0cc3edaf370752890 (patch)
treeaaf689ada6d7b8f1cc0dcde50100213a86470762 /hw/rdma/rdma_backend.c
parentcce648613bc802be1b894227f7fd94d88476ea07 (diff)
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>
Diffstat (limited to 'hw/rdma/rdma_backend.c')
-rw-r--r--hw/rdma/rdma_backend.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/hw/rdma/rdma_backend.c b/hw/rdma/rdma_backend.c
index ae1e4dcb29..bd4710d16f 100644
--- a/hw/rdma/rdma_backend.c
+++ b/hw/rdma/rdma_backend.c
@@ -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;
}