Hi Doug,
The NULL pointer bug is one of the most frequent issue we met
during hot plug stress test, thanks for this bug fix.
Reviewed-by: Kever Yang <kever.yang@xxxxxxxxxxxxxx>
Thanks,
- Kever
On 01/23/2016 02:18 AM, Douglas Anderson wrote:
When poking around with USB devices with slub_debug enabled, I found
another obvious use after free. Turns out that in dwc2_hc_n_intr() I
was in a state when the contents of chan->qh was filled with 0x6b,
indicating that chan->qh was freed but chan still had a reference to
it.
Let's make sure that whenever we free qh we also make sure we remove a
reference from its channel.
The bug fixed here doesn't appear to be new--I believe I just got lucky
and happened to see it while stress testing.
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---
Changes in v5: None
Changes in v4:
- Avoid use of chan->qh after qh freed new for v4.
Changes in v3: None
Changes in v2: None
drivers/usb/dwc2/hcd.c | 8 ++++++++
drivers/usb/dwc2/hcd_intr.c | 10 ++++++++++
2 files changed, 18 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index bc4bdbc1534e..7783c8ba0173 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -164,6 +164,9 @@ static void dwc2_qh_list_free(struct dwc2_hsotg *hsotg,
qtd_list_entry)
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
+ if (qh->channel && qh->channel->qh == qh)
+ qh->channel->qh = NULL;
+
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_hcd_qh_free(hsotg, qh);
spin_lock_irqsave(&hsotg->lock, flags);
@@ -554,7 +557,12 @@ static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg,
dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
ep->hcpriv = NULL;
+
+ if (qh->channel && qh->channel->qh == qh)
+ qh->channel->qh = NULL;
+
spin_unlock_irqrestore(&hsotg->lock, flags);
+
dwc2_hcd_qh_free(hsotg, qh);
return 0;
diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 352c98364317..99efc2bd1617 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -1935,6 +1935,16 @@ static void dwc2_hc_n_intr(struct dwc2_hsotg *hsotg, int chnum)
}
dwc2_writel(hcint, hsotg->regs + HCINT(chnum));
+
+ /*
+ * If we got an interrupt after someone called
+ * dwc2_hcd_endpoint_disable() we don't want to crash below
+ */
+ if (!chan->qh) {
+ dev_warn(hsotg->dev, "Interrupt on disabled channel\n");
+ return;
+ }
+
chan->hcint = hcint;
hcint &= hcintmsk;
--
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