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[PATCH] pvrdma: Ensure correct input on ring init (CVE-2021-3607)

From: Marcel Apfelbaum
Subject: [PATCH] pvrdma: Ensure correct input on ring init (CVE-2021-3607)
Date: Wed, 30 Jun 2021 14:46:34 +0300

Check the guest passed a non zero page count
for pvrdma device ring buffers.

Fixes: CVE-2021-3607
Reported-by: VictorV (Kunlun Lab) <vv474172261@gmail.com>
Reviewed-by: VictorV (Kunlun Lab) <vv474172261@gmail.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
 hw/rdma/vmw/pvrdma_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/rdma/vmw/pvrdma_main.c b/hw/rdma/vmw/pvrdma_main.c
index 84ae8024fc..7c0c3551a8 100644
--- a/hw/rdma/vmw/pvrdma_main.c
+++ b/hw/rdma/vmw/pvrdma_main.c
@@ -92,6 +92,11 @@ static int init_dev_ring(PvrdmaRing *ring, PvrdmaRingState 
     uint64_t *dir, *tbl;
     int rc = 0;
+    if (!num_pages) {
+        rdma_error_report("Ring pages count must be strictly positive");
+        return -EINVAL;
+    }
     dir = rdma_pci_dma_map(pci_dev, dir_addr, TARGET_PAGE_SIZE);
     if (!dir) {
         rdma_error_report("Failed to map to page directory (ring %s)", name);

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