If the hub_configure() fails after setting the hdev->maxchild
the hub->ports might be NULL or point to uninitialized kzallocated
memory causing NULL pointer dereference in hub_quiesce() during cleanup.
Now after such error the hdev->maxchild is set to 0 to avoid cleanup
of uninitialized ports.
Suggested-by: Alan Stern <st...@rowland.harvard.edu>
Signed-off-by: Krzysztof Mazur <krzys...@podlesie.net>
---
drivers/usb/core/hub.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 558313d..588c3a3 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1339,7 +1339,7 @@ static int hub_configure(struct usb_hub *hub,
GFP_KERNEL);
if (!hub->ports) {
ret = -ENOMEM;
- goto fail;
+ goto fail_maxchild;
}
wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
@@ -1466,7 +1466,7 @@ static int hub_configure(struct usb_hub *hub,
ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
if (ret < 2) {
message = "can't get hub status";
- goto fail;
+ goto fail_maxchild;
}
le16_to_cpus(&hubstatus);
hcd = bus_to_hcd(hdev->bus);
@@ -1512,14 +1512,14 @@ static int hub_configure(struct usb_hub *hub,
&hub->tt, GFP_KERNEL);
if (ret < 0) {
message = "can't update HCD hub info";
- goto fail;
+ goto fail_maxchild;
}
}
ret = hub_hub_status(hub, &hubstatus, &hubchange);
if (ret < 0) {
message = "can't get hub status";
- goto fail;
+ goto fail_maxchild;
}
/* local power status reports aren't always correct */
@@ -1547,7 +1547,7 @@ static int hub_configure(struct usb_hub *hub,
hub->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!hub->urb) {
ret = -ENOMEM;
- goto fail;
+ goto fail_maxchild;
}
usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
@@ -1567,6 +1567,8 @@ static int hub_configure(struct usb_hub *hub,
hub_activate(hub, HUB_INIT);
return 0;
+fail_maxchild:
+ hdev->maxchild = 0;
fail:
dev_err (hub_dev, "config failed, %s (err %d)\n",
message, ret);
--
1.8.4.rc1.409.gbd48715
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