Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1568309

[PATCH 3.12 018/235] usb: gadget: composite: correctly initialize ep->maxpacket

Show all headers | View raw

From: Felipe Balbi <felipe.balbi@linux.intel.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/usb/gadget/composite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index a0b5a13b52b0..bd6400b4af89 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -125,7 +125,7 @@ int config_ep_by_speed(struct usb_gadget *g,
 
 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;
-- 
2.11.0

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 3.12 001/235] driver core: Delete an unnecessary check before the function call "put_device" Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 015/235] USB: serial: kl5kusb105: fix open error path Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 018/235] usb: gadget: composite: correctly initialize ep->maxpacket Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 023/235] Btrfs: fix memory leak in reading btree blocks Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 012/235] Btrfs: fix tree search logic when replaying directory entry deletes Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 010/235] hotplug: Make register and unregister notifier API symmetric Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 003/235] ext4: fix data exposure after a crash Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 019/235] USB: UHCI: report non-PME wakeup signalling for Intel hardware Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 024/235] block_dev: don't test bdev->bd_contains when it is not stable Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 004/235] locking/rtmutex: Prevent dequeue vs. unlock race Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 030/235] ext4: add sanity checking to count_overhead() Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 009/235] m68k: Fix ndelay() macro Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 008/235] can: peak: fix bad memory access and free sequence Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 014/235] USB: serial: option: add dlink dwm-158 Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 013/235] USB: serial: option: add support for Telit LE922A PIDs 0x1040, 0x1041 Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100
  [PATCH 3.12 005/235] locking/rtmutex: Use READ_ONCE() in rt_mutex_owner() Jiri Slaby <jslaby@suse.cz> - 2017-01-27 13:10 +0100

csiph-web