[PATCH 09/12] vdpa/ifc: fix build with GCC 12

[David Marchand]

GCC 12 raises the following warning:

../drivers/vdpa/ifc/ifcvf_vdpa.c: In function ‘vdpa_enable_vfio_intr’:
../drivers/vdpa/ifc/ifcvf_vdpa.c:383:62: error: writing 4 bytes into a
    region of size 0 [-Werror=stringop-overflow=]
  383 |                         fd_ptr[RTE_INTR_VEC_RXTX_OFFSET + i] = fd;
      |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
../drivers/vdpa/ifc/ifcvf_vdpa.c:348:14: note: at offset 32 into
    destination object ‘irq_set_buf’ of size 32
  348 |         char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
      |              ^~~~~~~~~~~

Validate number of vrings to avoid out of bound access.

Cc: stable at dpdk.org

Signed-off-by: David Marchand <david.marchand at redhat.com>
---
 drivers/vdpa/ifc/ifcvf_vdpa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/vdpa/ifc/ifcvf_vdpa.c b/drivers/vdpa/ifc/ifcvf_vdpa.c
index 9f05595b6b..6708849bd3 100644
--- a/drivers/vdpa/ifc/ifcvf_vdpa.c
+++ b/drivers/vdpa/ifc/ifcvf_vdpa.c
@@ -354,6 +354,8 @@ vdpa_enable_vfio_intr(struct ifcvf_internal *internal, bool m_rx)
 	vring.callfd = -1;
 
 	nr_vring = rte_vhost_get_vring_num(internal->vid);
+	if (nr_vring > IFCVF_MAX_QUEUES * 2)
+		return -1;
 
 	irq_set = (struct vfio_irq_set *)irq_set_buf;
 	irq_set->argsz = sizeof(irq_set_buf);
-- 
2.36.1