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| author | Douglas Anderson | 2016-01-29 03:19:55 +0100 |
|---|---|---|
| committer | Felipe Balbi | 2016-03-04 14:14:40 +0100 |
| commit | 16e80218816488f016418717d23c660abe073a67 (patch) | |
| tree | 74dd155a1274bbc7eace92a76e7907c19d7ffddd /drivers/usb/dwc2/hcd_intr.c | |
| parent | usb: dwc2: host: Set host_rx_fifo_size to 525 for rk3066 (diff) | |
| download | kernel-qcow2-linux-16e80218816488f016418717d23c660abe073a67.tar.gz kernel-qcow2-linux-16e80218816488f016418717d23c660abe073a67.tar.xz kernel-qcow2-linux-16e80218816488f016418717d23c660abe073a67.zip | |
usb: dwc2: host: Avoid use of chan->qh after qh freed
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.
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb/dwc2/hcd_intr.c')
| -rw-r--r-- | drivers/usb/dwc2/hcd_intr.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c index 4270f6c719c6..0d0fd2a7f1f9 100644 --- a/drivers/usb/dwc2/hcd_intr.c +++ b/drivers/usb/dwc2/hcd_intr.c @@ -1943,6 +1943,16 @@ 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; |