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[Qemu-devel] [PATCH v2 1/6] rdma: check num_sge does not exceed MAX_SGE
From: |
P J P |
Subject: |
[Qemu-devel] [PATCH v2 1/6] rdma: check num_sge does not exceed MAX_SGE |
Date: |
Thu, 13 Dec 2018 01:00:34 +0530 |
From: Prasad J Pandit <address@hidden>
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 <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/rdma/rdma_backend.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
Update: No change, ack'd v1
-> https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02783.html
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;
}
--
2.19.2