Currently we are calling usb_submit_urb directly to submit deferred tx
urbs after unanchor them.
So the usb_giveback_urb_bh would failed to unref it in usb_unanchor_urb
and cause memory leak:
unreferenced object 0xffffffc0ce0fa400 (size 256):
...
backtrace:
[<ffffffc00034a9a8>] __save_stack_trace+0x48/0x6c
[<ffffffc00034b088>] create_object+0x138/0x254
[<ffffffc0009d5504>] kmemleak_alloc+0x58/0x8c
[<ffffffc000345f78>] __kmalloc+0x1d4/0x2a0
[<ffffffc0006765bc>] usb_alloc_urb+0x30/0x60
[<ffffffbffc128598>] alloc_ctrl_urb+0x38/0x120 [btusb]
[<ffffffbffc129e7c>] btusb_send_frame+0x64/0xf8 [btusb]
Put those urbs in tx_anchor to avoid the leak, and also fix the error
handling.
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
---
Changes in v6:
Don't print error msg when dropping urbs, since we already log it when
failed to submit.
Changes in v5:
Fix compile warning reported by "kbuild test robot":
drivers/bluetooth/btusb.c:3288:3: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
This 'err' would be set in the send loop, and would be used in the
cleanup rest urb code outside the loop.
Changes in v4:
Drop the rest deferred urbs when error happens.
Changes in v3:
Put the deferred urbs in tx_anchor.
Changes in v2:
Call usb_free_urb instead of reusing submit_tx_urb.
drivers/bluetooth/btusb.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 0d533b2..fa3de4f 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3266,13 +3266,28 @@ static void play_deferred(struct btusb_data *data)
int err;
while ((urb = usb_get_from_anchor(&data->deferred))) {
+ usb_anchor_urb(urb, &data->tx_anchor);
+
err = usb_submit_urb(urb, GFP_ATOMIC);
- if (err < 0)
+ if (err < 0) {
+ if (err != -EPERM && err != -ENODEV)
+ BT_ERR("%s urb %p submission failed (%d)",
+ data->hdev->name, urb, -err);
+ kfree(urb->setup_packet);
+ usb_unanchor_urb(urb);
+ usb_free_urb(urb);
break;
+ }
data->tx_in_flight++;
+ usb_free_urb(urb);
+ }
+
+ /* Cleanup the rest deferred urbs. */
+ while ((urb = usb_get_from_anchor(&data->deferred))) {
+ kfree(urb->setup_packet);
+ usb_free_urb(urb);
}
- usb_scuttle_anchored_urbs(&data->deferred);
}
static int btusb_resume(struct usb_interface *intf)
--
2.1.4
--
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