CVE: CVE-2018-20126
Upstream-Status: Backport [https://git.qemu.org/?p=qemu.git;a=commit;h=509f57c]

Backport and rebase patch to fix CVE-2018-20126.

Signed-off-by: Kai Kang <kai.kang@windriver.com>

From 509f57c98e7536905bb4902363d0cba66ce7e089 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 13 Dec 2018 01:00:37 +0530
Subject: [PATCH] pvrdma: release ring object in case of an error

create_cq and create_qp routines allocate ring object, but it's
not released in case of an error, leading to memory leakage.

Reported-by: Li Qiang <liq3ea@163.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>
---
 hw/rdma/vmw/pvrdma_cmd.c | 41 ++++++++++++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 11 deletions(-)

diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
index 4faeb21..9b6796f 100644
--- a/hw/rdma/vmw/pvrdma_cmd.c
+++ b/hw/rdma/vmw/pvrdma_cmd.c
@@ -310,6 +310,14 @@ out:
     return rc;
 }
 
+static void destroy_cq_ring(PvrdmaRing *ring)
+{
+    pvrdma_ring_free(ring);
+    /* ring_state was in slot 1, not 0 so need to jump back */
+    rdma_pci_dma_unmap(ring->dev, --ring->ring_state, TARGET_PAGE_SIZE);
+    g_free(ring);
+}
+
 static int create_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
                      union pvrdma_cmd_resp *rsp)
 {
@@ -333,6 +341,10 @@ static int create_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
 
     resp->hdr.err = rdma_rm_alloc_cq(&dev->rdma_dev_res, &dev->backend_dev,
                                      cmd->cqe, &resp->cq_handle, ring);
+    if (resp->hdr.err) {
+        destroy_cq_ring(ring);
+    }
+
     resp->cqe = cmd->cqe;
 
 out:
@@ -356,10 +368,7 @@ static int destroy_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
     }
 
     ring = (PvrdmaRing *)cq->opaque;
-    pvrdma_ring_free(ring);
-    /* ring_state was in slot 1, not 0 so need to jump back */
-    rdma_pci_dma_unmap(PCI_DEVICE(dev), --ring->ring_state, TARGET_PAGE_SIZE);
-    g_free(ring);
+    destroy_cq_ring(ring);
 
     rdma_rm_dealloc_cq(&dev->rdma_dev_res, cmd->cq_handle);
 
@@ -451,6 +460,17 @@ out:
     return rc;
 }
 
+static void destroy_qp_rings(PvrdmaRing *ring)
+{
+    pr_dbg("sring=%p\n", &ring[0]);
+    pvrdma_ring_free(&ring[0]);
+    pr_dbg("rring=%p\n", &ring[1]);
+    pvrdma_ring_free(&ring[1]);
+
+    rdma_pci_dma_unmap(ring->dev, ring->ring_state, TARGET_PAGE_SIZE);
+    g_free(ring);
+}
+
 static int create_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
                      union pvrdma_cmd_resp *rsp)
 {
@@ -482,6 +502,11 @@ static int create_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
                                      cmd->max_recv_wr, cmd->max_recv_sge,
                                      cmd->recv_cq_handle, rings, &resp->qpn);
 
+    if (resp->hdr.err) {
+        destroy_qp_rings(rings);
+        return resp->hdr.err;
+    }
+
     resp->max_send_wr = cmd->max_send_wr;
     resp->max_recv_wr = cmd->max_recv_wr;
     resp->max_send_sge = cmd->max_send_sge;
@@ -555,13 +580,7 @@ static int destroy_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
     rdma_rm_dealloc_qp(&dev->rdma_dev_res, cmd->qp_handle);
 
     ring = (PvrdmaRing *)qp->opaque;
-    pr_dbg("sring=%p\n", &ring[0]);
-    pvrdma_ring_free(&ring[0]);
-    pr_dbg("rring=%p\n", &ring[1]);
-    pvrdma_ring_free(&ring[1]);
-
-    rdma_pci_dma_unmap(PCI_DEVICE(dev), ring->ring_state, TARGET_PAGE_SIZE);
-    g_free(ring);
+    destroy_qp_rings(ring);
 
     return 0;
 }
-- 
2.20.1