hw: nvme: Separate 'serial' property for VFs

hw: nvme: Separate 'serial' property for VFs

[Minwoo Im]

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>
---
 hw/nvme/ctrl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index f026245d1e..a0ba3529cd 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -8309,9 +8309,15 @@ 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;
     }
 
-- 
2.34.1

Re: hw: nvme: Separate 'serial' property for VFs

[Klaus Jensen]

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On Jan  9 11:29, Minwoo Im wrote:
> 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>

Thanks Minwoo! Queued on nvme-next.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>

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