target/linux/brcm2708/patches-3.10/0053-dwc_otg-fix-potential-use-after-free-case-in-interru.patch

   1 From 51d7ae6f936ea32dedbe423fab97e3281994fe82 Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Thu, 28 Feb 2013 16:52:51 +0000
   4 Subject: [PATCH 053/174] dwc_otg: fix potential use-after-free case in
   5  interrupt handler
   6
   7 If a transaction had previously aborted, certain interrupts are
   8 enabled to track error counts and reset where necessary. On IN
   9 endpoints the host generates an ACK interrupt near-simultaneously
  10 with completion of transfer. In the case where this transfer had
  11 previously had an error, this results in a use-after-free on
  12 the QTD memory space with a 1-byte length being overwritten to
  13 0x00.
  14 ---
  15  drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 3 ++-
  16  1 file changed, 2 insertions(+), 1 deletion(-)
  17
  18 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  19 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
  20 @@ -2223,7 +2223,8 @@ int32_t dwc_otg_hcd_handle_hc_n_intr(dwc
  21                 retval |= handle_hc_nak_intr(dwc_otg_hcd, hc, hc_regs, qtd);
  22         }
  23         if (hcint.b.ack) {
  24 -               retval |= handle_hc_ack_intr(dwc_otg_hcd, hc, hc_regs, qtd);
  25 +               if(!hcint.b.chhltd)
  26 +                       retval |= handle_hc_ack_intr(dwc_otg_hcd, hc, hc_regs, qtd);
  27         }
  28         if (hcint.b.nyet) {
  29                 retval |= handle_hc_nyet_intr(dwc_otg_hcd, hc, hc_regs, qtd);