From: Marek Szyprowski <m.szyprowski@samsung.com>
To: linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Minas Harutyunyan <hminas@synopsys.com>,
Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH] usb: dwc2: gadget: don't reset gadget's driver->bus
Date: Thu, 5 May 2022 12:46:18 +0200 [thread overview]
Message-ID: <20220505104618.22729-1-m.szyprowski@samsung.com> (raw)
In-Reply-To: CGME20220505104630eucas1p1e3797aef5ed7f54f861bf3622b542713@eucas1p1.samsung.com
UDC driver should not touch gadget's driver internals, especially it
should not reset driver->bus. This wasn't harmful so far, but since
commit fc274c1e9973 ("USB: gadget: Add a new bus for gadgets") gadget
subsystem got it's own bus and messing with ->bus triggers the
following NULL pointer dereference:
dwc2 12480000.hsotg: bound driver g_ether
8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in: ...
CPU: 0 PID: 620 Comm: modprobe Not tainted 5.18.0-rc5-next-20220504 #11862
Hardware name: Samsung Exynos (Flattened Device Tree)
PC is at module_add_driver+0x44/0xe8
LR is at sysfs_do_create_link_sd+0x84/0xe0
...
Process modprobe (pid: 620, stack limit = 0x(ptrval))
...
module_add_driver from bus_add_driver+0xf4/0x1e4
bus_add_driver from driver_register+0x78/0x10c
driver_register from usb_gadget_register_driver_owner+0x40/0xb4
usb_gadget_register_driver_owner from do_one_initcall+0x44/0x1e0
do_one_initcall from do_init_module+0x44/0x1c8
do_init_module from load_module+0x19b8/0x1b9c
load_module from sys_finit_module+0xdc/0xfc
sys_finit_module from ret_fast_syscall+0x0/0x54
Exception stack(0xf1771fa8 to 0xf1771ff0)
...
dwc2 12480000.hsotg: new device is high-speed
---[ end trace 0000000000000000 ]---
Fix this by removing driver->bus entry reset.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
drivers/usb/dwc2/gadget.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index eee3504397e6..fe2a58c75861 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -4544,7 +4544,6 @@ static int dwc2_hsotg_udc_start(struct usb_gadget *gadget,
WARN_ON(hsotg->driver);
- driver->driver.bus = NULL;
hsotg->driver = driver;
hsotg->gadget.dev.of_node = hsotg->dev->of_node;
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
--
2.17.1
next parent reply other threads:[~2022-05-05 10:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220505104630eucas1p1e3797aef5ed7f54f861bf3622b542713@eucas1p1.samsung.com>
2022-05-05 10:46 ` Marek Szyprowski [this message]
2022-05-13 7:18 ` [PATCH] usb: dwc2: gadget: don't reset gadget's driver->bus Minas Harutyunyan
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