[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20220607180133.481701-11-sashal@kernel.org>
Date: Tue, 7 Jun 2022 14:01:15 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sasha Levin <sashal@...nel.org>, hminas@...opsys.com,
linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 11/27] usb: dwc2: gadget: don't reset gadget's driver->bus
From: Marek Szyprowski <m.szyprowski@...sung.com>
[ Upstream commit 3120aac6d0ecd9accf56894aeac0e265f74d3d5a ]
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@...sung.com>
Link: https://lore.kernel.org/r/20220505104618.22729-1-m.szyprowski@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
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 1e46005929e4..85d25f7e9c27 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -4326,7 +4326,6 @@ 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;
--
2.35.1
Powered by blists - more mailing lists