diff options
| author | William Wu <william.wu@rock-chips.com> | 2018-05-21 13:12:00 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-08 16:30:46 +0300 |
| commit | 447294efb995181076c2c34e9c6bee1703c74a9a (patch) | |
| tree | b33f55354ff17315feeac24439081cdf45c551c0 /drivers/usb | |
| parent | e80add5223dda08db1e5453a0ed4bc1175f394e9 (diff) | |
| download | linux-447294efb995181076c2c34e9c6bee1703c74a9a.tar.xz | |
usb: dwc2: fix the incorrect bitmaps for the ports of multi_tt hub
commit 8760675932ddb614e83702117d36ea644050c609 upstream.
The dwc2_get_ls_map() use ttport to reference into the
bitmap if we're on a multi_tt hub. But the bitmaps index
from 0 to (hub->maxchild - 1), while the ttport index from
1 to hub->maxchild. This will cause invalid memory access
when the number of ttport is hub->maxchild.
Without this patch, I can easily meet a Kernel panic issue
if connect a low-speed USB mouse with the max port of FE2.1
multi-tt hub (1a40:0201) on rk3288 platform.
Fixes: 9f9f09b048f5 ("usb: dwc2: host: Totally redo the microframe scheduler")
Cc: <stable@vger.kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Minas Harutyunyan hminas@synopsys.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc2/hcd_queue.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c index 3ae8b1bbaa55..7f51a77bc5cc 100644 --- a/drivers/usb/dwc2/hcd_queue.c +++ b/drivers/usb/dwc2/hcd_queue.c @@ -379,7 +379,7 @@ static unsigned long *dwc2_get_ls_map(struct dwc2_hsotg *hsotg, /* Get the map and adjust if this is a multi_tt hub */ map = qh->dwc_tt->periodic_bitmaps; if (qh->dwc_tt->usb_tt->multi) - map += DWC2_ELEMENTS_PER_LS_BITMAP * qh->ttport; + map += DWC2_ELEMENTS_PER_LS_BITMAP * (qh->ttport - 1); return map; } |