diff mbox

[dpdk-dev,3/3] net/virtio: fix crash when number of virtio devices > 1

Message ID 1485074820-8956-4-git-send-email-yuanhan.liu@linux.intel.com (mailing list archive)
State Accepted, archived
Delegated to: Yuanhan Liu
Headers

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel compilation success Compilation OK

Commit Message

Yuanhan Liu Jan. 22, 2017, 8:47 a.m. UTC 
  The vtpci_ops assignment needs the 'hw->port_id' as an input parameter.
That said, we should set 'hw->port_id' firstly, then do the vtpci_ops
assignment, while the code does reversely. That would result to a crash
when more than one virtio devices are used, because we keep assigning
proper vtpci_ops to virtio_hw_internal[0]->vtpci_ops, leaving the pointer
for other ports being NULL.

Reverse the order fixes this issue.

Fixes: 9470427c88e1 ("net/virtio: do not store PCI device pointer at shared memory")

Cc: stable@dpdk.org
Reported-by: Lei Yao <lei.a.yao@intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Maxime Coquelin Jan. 23, 2017, 7:58 a.m. UTC | #1 
On 01/22/2017 09:47 AM, Yuanhan Liu wrote:
> The vtpci_ops assignment needs the 'hw->port_id' as an input parameter.
> That said, we should set 'hw->port_id' firstly, then do the vtpci_ops
> assignment, while the code does reversely. That would result to a crash
> when more than one virtio devices are used, because we keep assigning
> proper vtpci_ops to virtio_hw_internal[0]->vtpci_ops, leaving the pointer
> for other ports being NULL.
>
> Reverse the order fixes this issue.
>
> Fixes: 9470427c88e1 ("net/virtio: do not store PCI device pointer at shared memory")
>
> Cc: stable@dpdk.org
> Reported-by: Lei Yao <lei.a.yao@intel.com>
> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
> ---
>  drivers/net/virtio/virtio_ethdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
diff mbox

Patch

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 1d51942..68dde08 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1515,6 +1515,7 @@  static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 		return -ENOMEM;
 	}
 
+	hw->port_id = eth_dev->data->port_id;
 	/* For virtio_user case the hw->virtio_user_dev is populated by
 	 * virtio_user_eth_dev_alloc() before eth_virtio_dev_init() is called.
 	 */
@@ -1525,7 +1526,6 @@  static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 			return ret;
 	}
 
-	hw->port_id = eth_dev->data->port_id;
 	eth_dev->data->dev_flags = dev_flags;
 
 	/* reset device and negotiate default features */