Sometimes xennet_create_queues() may failed to created all requested
queues, we need to update num_queues to real created to avoid NULL
pointer dereference.
Signed-off-by: Joe Jin <joe.jin@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
---
drivers/net/xen-netfront.c | 9 ++++++---
1 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index f821a97..d580aec 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1746,7 +1746,7 @@ static int xennet_create_queues(struct netfront_info *info,
dev_err(&info->netdev->dev, "no queues\n");
return -EINVAL;
}
- return 0;
+ return num_queues;
}
/* Common code used when first setting up, and when resuming. */
@@ -1788,9 +1788,12 @@ static int talk_to_netback(struct xenbus_device *dev,
if (info->queues)
xennet_destroy_queues(info);
- err = xennet_create_queues(info, num_queues);
- if (err < 0)
+ /* Update queues number to real created */
+ num_queues = xennet_create_queues(info, num_queues);
+ if (num_queues < 0) {
+ err = num_queues;
goto destroy_ring;
+ }
/* Create shared ring, alloc event channel -- for each queue */
for (i = 0; i < num_queues; ++i) {
--
1.7.1
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