hw/nvme: separate 'serial' property for VFs

Currently, when a VF is created, it uses the 'params' object of the PF
as it is. In other words, the 'params.serial' string memory area is also
shared. In this situation, if the VF is removed from the system, the
PF's 'params.serial' object is released with object_finalize() followed
by object_property_del_all() which release the memory for 'serial'
property. If that happens, the next VF created will inherit a serial
from a corrupted memory area.

If this happens, an error will occur when comparing subsys->serial and
n->params.serial in the nvme_subsys_register_ctrl() function.

Cc: qemu-stable@nongnu.org
Fixes: 44c2c09488db ("hw/nvme: Add support for SR-IOV")
Signed-off-by: Minwoo Im <minwoo.im@samsung.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
(cherry picked from commit 4f0a4a3d5854824e5c5eccf353d4a1f4f749a29d)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index f2b308f5fa150c71a42414c7ee3ab0b6cd35fceb..c2c0fc991de84d2e487a141bfa34115b840741a3 100644 (file)
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -7515,9 +7515,15 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
     if (pci_is_vf(pci_dev)) {
         /*
          * VFs derive settings from the parent. PF's lifespan exceeds
-         * that of VF's, so it's safe to share params.serial.
+         * that of VF's.
          */
         memcpy(&n->params, &pn->params, sizeof(NvmeParams));
+
+        /*
+         * Set PF's serial value to a new string memory to prevent 'serial'
+         * property object release of PF when a VF is removed from the system.
+         */
+        n->params.serial = g_strdup(pn->params.serial);
         n->subsys = pn->subsys;
     }