This is a note to let you know that I've just added the patch titled
usb: gadget: composite: correctly initialize ep->maxpacket
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-gadget-composite-correctly-initialize-ep-maxpacket.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e8f29bb719b47a234f33b0af62974d7a9521a52c Mon Sep 17 00:00:00 2001
From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Date: Wed, 28 Sep 2016 10:38:11 +0300
Subject: usb: gadget: composite: correctly initialize ep->maxpacket
From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
commit e8f29bb719b47a234f33b0af62974d7a9521a52c upstream.
usb_endpoint_maxp() returns wMaxPacketSize in its
raw form. Without taking into consideration that it
also contains other bits reserved for isochronous
endpoints.
This patch fixes one occasion where this is a
problem by making sure that we initialize
ep->maxpacket only with lower 10 bits of the value
returned by usb_endpoint_maxp(). Note that seperate
patches will be necessary to audit all call sites of
usb_endpoint_maxp() and make sure that
usb_endpoint_maxp() only returns lower 10 bits of
wMaxPacketSize.
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/composite.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -144,7 +144,7 @@ int config_ep_by_speed(struct usb_gadget
ep_found:
/* commit results */
- _ep->maxpacket = usb_endpoint_maxp(chosen_desc);
+ _ep->maxpacket = usb_endpoint_maxp(chosen_desc) & 0x7ff;
_ep->desc = chosen_desc;
_ep->comp_desc = NULL;
_ep->maxburst = 0;
Patches currently in stable-queue which might be from felipe.balbi@xxxxxxxxxxxxxxx are
queue-4.4/usb-gadget-composite-always-set-ep-mult-to-a-sensible-value.patch
queue-4.4/usb-gadget-f_uac2-fix-error-handling-at-afunc_bind.patch
queue-4.4/usb-gadget-composite-correctly-initialize-ep-maxpacket.patch
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