[lkml]   [2018]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 4.14 04/61] usb: dwc2: fix the incorrect bitmaps for the ports of multi_tt hub
4.14-stable review patch.  If anyone has any objections, please let me know.


From: William Wu <>

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: <>
Reviewed-by: Douglas Anderson <>
Acked-by: Minas Harutyunyan>
Signed-off-by: William Wu <>
Signed-off-by: Felipe Balbi <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/usb/dwc2/hcd_queue.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- 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(st
/* 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;

 \ /
  Last update: 2018-07-06 08:03    [W:0.205 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site