xhci: fix memleak in xhci_run()

Found this issue by kmemleak.
xhci_run() did not check return val and free command for
xhci_queue_vendor_command()

unreferenced object 0xffff88011c0be500 (size 64):
  comm "kworker/0:1", pid 58, jiffies 4294670908 (age 50.420s)
  hex dump (first 32 bytes):
  backtrace:
    [<ffffffff8176166a>] kmemleak_alloc+0x4a/0xa0
    [<ffffffff8121801a>] kmem_cache_alloc_trace+0xca/0x1d0
    [<ffffffff81576bf4>] xhci_alloc_command+0x44/0x130
    [<ffffffff8156f1cc>] xhci_run+0x4cc/0x630
    [<ffffffff8153b84b>] usb_add_hcd+0x3bb/0x950
    [<ffffffff8154eac8>] usb_hcd_pci_probe+0x188/0x500
    [<ffffffff815851ac>] xhci_pci_probe+0x2c/0x220
    [<ffffffff813d2ca5>] local_pci_probe+0x45/0xa0
    [<ffffffff810a54e4>] work_for_cpu_fn+0x14/0x20
    [<ffffffff810a8409>] process_one_work+0x149/0x360
    [<ffffffff810a8d08>] worker_thread+0x1d8/0x3c0
    [<ffffffff810ae7d9>] kthread+0x109/0x140
    [<ffffffff8176d585>] ret_from_fork+0x25/0x30
    [<ffffffffffffffff>] 0xffffffffffffffff

Cc: <stable@vger.kernel.org>
Signed-off-by: Shu Wang <shuwang@redhat.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 51326425f9cc799c2d81d910e9d1a7575b4a8bbb..b2ff1ff1a02faff066374cafdf9fa5b531db5b81 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -625,8 +625,10 @@ int xhci_run(struct usb_hcd *hcd)
                if (!command)
                        return -ENOMEM;
 
-               xhci_queue_vendor_command(xhci, command, 0, 0, 0,
+               ret = xhci_queue_vendor_command(xhci, command, 0, 0, 0,
                                TRB_TYPE(TRB_NEC_GET_FW));
+               if (ret)
+                       xhci_free_command(xhci, command);
        }
        xhci_dbg_trace(xhci, trace_xhci_dbg_init,
                        "Finished xhci_run for USB2 roothub");