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- From 89778ba335e302a450932ce5b703c1ee6216e949 Mon Sep 17 00:00:00 2001
- From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
- Date: Tue, 6 Dec 2016 00:39:33 +0100
- Subject: [PATCH] usb: core: usbport: Use proper LED API to fix potential crash
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
- Calling brightness_set manually isn't safe as some LED drivers don't
- implement this callback. The best idea is to just use a proper helper
- which will fallback to the brightness_set_blocking callback if needed.
- This fixes:
- [ 1461.761528] Unable to handle kernel NULL pointer dereference at virtual address 00000000
- (...)
- [ 1462.117049] Backtrace:
- [ 1462.119521] [<bf228164>] (usbport_trig_port_store [ledtrig_usbport]) from [<c023f758>] (dev_attr_store+0x20/0x2c)
- [ 1462.129826] r7:dcabc7c0 r6:dee0ff80 r5:00000002 r4:bf228164
- [ 1462.135511] [<c023f738>] (dev_attr_store) from [<c0169310>] (sysfs_kf_write+0x48/0x4c)
- [ 1462.143459] r5:00000002 r4:c023f738
- [ 1462.147049] [<c01692c8>] (sysfs_kf_write) from [<c0168ab8>] (kernfs_fop_write+0xf8/0x1f8)
- [ 1462.155258] r5:00000002 r4:df4a1000
- [ 1462.158850] [<c01689c0>] (kernfs_fop_write) from [<c0100c78>] (__vfs_write+0x34/0x120)
- [ 1462.166800] r10:00000000 r9:dee0e000 r8:c000fc24 r7:00000002 r6:dee0ff80 r5:c01689c0
- [ 1462.174660] r4:df727a80
- [ 1462.177204] [<c0100c44>] (__vfs_write) from [<c0101ae4>] (vfs_write+0xac/0x170)
- [ 1462.184543] r9:dee0e000 r8:c000fc24 r7:dee0ff80 r6:b6f092d0 r5:df727a80 r4:00000002
- [ 1462.192319] [<c0101a38>] (vfs_write) from [<c01028dc>] (SyS_write+0x4c/0xa8)
- [ 1462.199396] r9:dee0e000 r8:c000fc24 r7:00000002 r6:b6f092d0 r5:df727a80 r4:df727a80
- [ 1462.207174] [<c0102890>] (SyS_write) from [<c000fa60>] (ret_fast_syscall+0x0/0x3c)
- [ 1462.214774] r7:00000004 r6:ffffffff r5:00000000 r4:00000000
- [ 1462.220456] Code: bad PC value
- [ 1462.223560] ---[ end trace 676638a3a12c7a56 ]---
- Reported-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
- Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
- Fixes: 0f247626cbb ("usb: core: Introduce a USB port LED trigger")
- Cc: stable@vger.kernel.org # 4.9+
- Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- ---
- drivers/usb/core/ledtrig-usbport.c | 7 +++----
- 1 file changed, 3 insertions(+), 4 deletions(-)
- --- a/drivers/usb/core/ledtrig-usbport.c
- +++ b/drivers/usb/core/ledtrig-usbport.c
- @@ -74,8 +74,7 @@ static void usbport_trig_update_count(st
-
- usbport_data->count = 0;
- usb_for_each_dev(usbport_data, usbport_trig_usb_dev_check);
- - led_cdev->brightness_set(led_cdev,
- - usbport_data->count ? LED_FULL : LED_OFF);
- + led_set_brightness(led_cdev, usbport_data->count ? LED_FULL : LED_OFF);
- }
-
- /***************************************
- @@ -228,12 +227,12 @@ static int usbport_trig_notify(struct no
- case USB_DEVICE_ADD:
- usbport_trig_add_usb_dev_ports(usb_dev, usbport_data);
- if (observed && usbport_data->count++ == 0)
- - led_cdev->brightness_set(led_cdev, LED_FULL);
- + led_set_brightness(led_cdev, LED_FULL);
- return NOTIFY_OK;
- case USB_DEVICE_REMOVE:
- usbport_trig_remove_usb_dev_ports(usbport_data, usb_dev);
- if (observed && --usbport_data->count == 0)
- - led_cdev->brightness_set(led_cdev, LED_OFF);
- + led_set_brightness(led_cdev, LED_OFF);
- return NOTIFY_OK;
- }
-
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