This is a note to let you know that I've just added the patch titled
usb: gadget: f_hid: fix report descriptor allocation
to the 4.19-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_hid-fix-report-descriptor-allocation.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 61890dc28f7d9e9aac8a9471302613824c22fae4 Mon Sep 17 00:00:00 2001
From: Konstantin Aladyshev <aladyshev22@xxxxxxxxx>
Date: Wed, 6 Dec 2023 11:07:44 +0300
Subject: usb: gadget: f_hid: fix report descriptor allocation
From: Konstantin Aladyshev <aladyshev22@xxxxxxxxx>
commit 61890dc28f7d9e9aac8a9471302613824c22fae4 upstream.
The commit 89ff3dfac604 ("usb: gadget: f_hid: fix f_hidg lifetime vs
cdev") has introduced a bug that leads to hid device corruption after
the replug operation.
Reverse device managed memory allocation for the report descriptor
to fix the issue.
Tested:
This change was tested on the AMD EthanolX CRB server with the BMC
based on the OpenBMC distribution. The BMC provides KVM functionality
via the USB gadget device:
- before: KVM page refresh results in a broken USB device,
- after: KVM page refresh works without any issues.
Fixes: 89ff3dfac604 ("usb: gadget: f_hid: fix f_hidg lifetime vs cdev")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Konstantin Aladyshev <aladyshev22@xxxxxxxxx>
Link: https://lore.kernel.org/r/20231206080744.253-2-aladyshev22@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/function/f_hid.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -88,6 +88,7 @@ static void hidg_release(struct device *
{
struct f_hidg *hidg = container_of(dev, struct f_hidg, dev);
+ kfree(hidg->report_desc);
kfree(hidg->set_report_buf);
kfree(hidg);
}
@@ -1293,9 +1294,9 @@ static struct usb_function *hidg_alloc(s
hidg->report_length = opts->report_length;
hidg->report_desc_length = opts->report_desc_length;
if (opts->report_desc) {
- hidg->report_desc = devm_kmemdup(&hidg->dev, opts->report_desc,
- opts->report_desc_length,
- GFP_KERNEL);
+ hidg->report_desc = kmemdup(opts->report_desc,
+ opts->report_desc_length,
+ GFP_KERNEL);
if (!hidg->report_desc) {
put_device(&hidg->dev);
--opts->refcnt;
Patches currently in stable-queue which might be from aladyshev22@xxxxxxxxx are
queue-4.19/usb-gadget-f_hid-fix-report-descriptor-allocation.patch
