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