This is a note to let you know that I've just added the patch titled
usb: gadget: f_fs: Process all descriptors during bind
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-f_fs-process-all-descriptors-during-bind.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 6cf439e0d37463e42784271179c8a308fd7493c6 Mon Sep 17 00:00:00 2001
From: Jack Pham <jackp@xxxxxxxxxxxxxx>
Date: Wed, 24 Jan 2018 00:11:53 -0800
Subject: usb: gadget: f_fs: Process all descriptors during bind
From: Jack Pham <jackp@xxxxxxxxxxxxxx>
commit 6cf439e0d37463e42784271179c8a308fd7493c6 upstream.
During _ffs_func_bind(), the received descriptors are evaluated
to prepare for binding with the gadget in order to allocate
endpoints and optionally set up OS descriptors. However, the
high- and super-speed descriptors are only parsed based on
whether the gadget_is_dualspeed() and gadget_is_superspeed()
calls are true, respectively.
This is a problem in case a userspace program always provides
all of the {full,high,super,OS} descriptors when configuring a
function. Then, for example if a gadget device is not capable
of SuperSpeed, the call to ffs_do_descs() for the SS descriptors
is skipped, resulting in an incorrect offset calculation for
the vla_ptr when moving on to the OS descriptors that follow.
This causes ffs_do_os_descs() to fail as it is now looking at
the SS descriptors' offset within the raw_descs buffer instead.
_ffs_func_bind() should evaluate the descriptors unconditionally,
so remove the checks for gadget speed.
Fixes: f0175ab51993 ("usb: gadget: f_fs: OS descriptors support")
Cc: stable@xxxxxxxxxxxxxxx
Co-Developed-by: Mayank Rana <mrana@xxxxxxxxxxxxxx>
Signed-off-by: Mayank Rana <mrana@xxxxxxxxxxxxxx>
Signed-off-by: Jack Pham <jackp@xxxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/function/f_fs.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2756,10 +2756,8 @@ static int _ffs_func_bind(struct usb_con
struct ffs_data *ffs = func->ffs;
const int full = !!func->ffs->fs_descs_count;
- const int high = gadget_is_dualspeed(func->gadget) &&
- func->ffs->hs_descs_count;
- const int super = gadget_is_superspeed(func->gadget) &&
- func->ffs->ss_descs_count;
+ const int high = !!func->ffs->hs_descs_count;
+ const int super = !!func->ffs->ss_descs_count;
int fs_len, hs_len, ss_len, ret, i;
struct ffs_ep *eps_ptr;
Patches currently in stable-queue which might be from jackp@xxxxxxxxxxxxxx are
queue-4.4/usb-gadget-f_fs-process-all-descriptors-during-bind.patch