diff options
| author | Bruno Prémont <bonbons@linux-vserver.org> | 2012-07-30 21:38:50 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-08-15 10:11:43 +0200 |
| commit | b07072e6a27253b5eb7d21049a108449920b4c50 (patch) | |
| tree | eb675d342a650f29164a49386015d0c1309509ea /drivers/hid/hid-picolcd_leds.c | |
| parent | HID: picoLCD: Replace own refcounting with fbdev's (diff) | |
| download | linux-b07072e6a27253b5eb7d21049a108449920b4c50.tar.xz linux-b07072e6a27253b5eb7d21049a108449920b4c50.zip | |
HID: picoLCD: prevent NULL pointer dereference on unplug
[ 679.807480] BUG: unable to handle kernel NULL pointer dereference at 00000074
[ 679.814457] IP: [<de93b5bf>] picolcd_led_set_brightness+0x1f/0xb0 [hid_picolcd]
[ 679.814457] *pde = 00000000
[ 679.814457] Oops: 0000 [#1]
[ 679.814457] Modules linked in: hid_picolcd fb_sys_fops sysimgblt sysfillrect syscopyarea drm_kms_helper nfs lockd nfs_acl sunrpc [last unloaded: hid_picolcd]
[ 679.814457]
[ 679.814457] Pid: 272, comm: khubd Not tainted 3.5.0-jupiter-00006-g463a4c0 #1 NVIDIA Corporation. nFORCE-MCP/MS-6373
[ 679.814457] EIP: 0060:[<de93b5bf>] EFLAGS: 00010246 CPU: 0
[ 679.814457] EIP is at picolcd_led_set_brightness+0x1f/0xb0 [hid_picolcd]
[ 679.814457] EAX: 00000000 EBX: d9f0c4e0 ECX: 00000000 EDX: 00000000
[ 679.814457] ESI: 00000000 EDI: dd6b79c0 EBP: dd4f7d90 ESP: dd4f7d80
[ 679.814457] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[ 679.814457] CR0: 8005003b CR2: 00000074 CR3: 1d74e000 CR4: 000007d0
[ 679.814457] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 679.814457] DR6: ffff0ff0 DR7: 00000400
[ 679.814457] Process khubd (pid: 272, ti=dd4f6000 task=dd442470 task.ti=dd4f6000)
[ 679.814457] Stack:
[ 679.814457] 1d6c3300 d9f0c4e0 d9f0c4e0 dd6b79c0 dd4f7da0 c132912a 00000000 d9f0c4e0
[ 679.814457] dd4f7dac c132935d 00000000 dd4f7dc0 de93b847 dd6b79c0 00000282 c700ecc8
[ 679.814457] dd4f7ddc de93924f 00000004 c700ecc8 c700e060 c700ecbc c15ee300 dd4f7dec
[ 679.814457] Call Trace:
[ 679.814457] [<c132912a>] led_brightness_set+0x2a/0x30
[ 679.814457] [<c132935d>] led_classdev_unregister+0xd/0x50
[ 679.814457] [<de93b847>] picolcd_exit_leds+0x27/0x40 [hid_picolcd]
[ 679.814457] [<de93924f>] picolcd_remove+0xbf/0x110 [hid_picolcd]
[ 679.814457] [<c132c5dd>] hid_device_remove+0x3d/0x80
[ 679.814457] [<c1294126>] __device_release_driver+0x56/0xa0
[ 679.814457] [<c1294190>] device_release_driver+0x20/0x30
[ 679.814457] [<c1293bbf>] bus_remove_device+0x9f/0xc0
[ 679.814457] [<c1291a1d>] device_del+0xdd/0x150
[ 679.814457] [<c132c205>] hid_destroy_device+0x25/0x60
[ 679.814457] [<c13368cb>] usbhid_disconnect+0x1b/0x40
[ 679.814457] [<c12f4976>] usb_unbind_interface+0x46/0x170
[ 679.814457] [<c1294126>] __device_release_driver+0x56/0xa0
[ 679.814457] [<c1294190>] device_release_driver+0x20/0x30
[ 679.814457] [<c1293bbf>] bus_remove_device+0x9f/0xc0
[ 679.814457] [<c1291a1d>] device_del+0xdd/0x150
[ 679.814457] [<c12f2975>] usb_disable_device+0x85/0x1a0
[ 679.814457] [<c1053146>] ? __cond_resched+0x16/0x30
[ 679.814457] [<c12ebdb0>] usb_disconnect+0x80/0xf0
[ 679.814457] [<c12ed61f>] hub_thread+0x3df/0x1030
[ 679.814457] [<c10484a0>] ? wake_up_bit+0x30/0x30
[ 679.814457] [<c12ed240>] ? usb_remote_wakeup+0x40/0x40
[ 679.814457] [<c1047f94>] kthread+0x74/0x80
[ 679.814457] [<c1047f20>] ? flush_kthread_worker+0x90/0x90
[ 679.814457] [<c140e33e>] kernel_thread_helper+0x6/0xd
[ 679.814457] Code: e0 25 00 e0 ff ff ff 48 14 eb 99 90 55 89 e5 83 ec 10 89 5d f4 89 75 f8 89 c3 89 7d fc 8b 40 1c 89 d6 8b 00 e8 13 89 95 e2 31 c9 <39> 5c 88 74 74 13 41 83 f9 08 75 f4 8b 5d f4 8b 75 f8 8b 7d fc
[ 679.814457] EIP: [<de93b5bf>] picolcd_led_set_brightness+0x1f/0xb0 [hid_picolcd] SS:ESP 0068:dd4f7d80
[ 679.814457] CR2: 0000000000000074
[ 680.116438] ---[ end trace 6f0d9d63bff280ff ]---
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-picolcd_leds.c')
| -rw-r--r-- | drivers/hid/hid-picolcd_leds.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hid/hid-picolcd_leds.c b/drivers/hid/hid-picolcd_leds.c index 9249c068a485..5573cd8b240b 100644 --- a/drivers/hid/hid-picolcd_leds.c +++ b/drivers/hid/hid-picolcd_leds.c @@ -69,6 +69,8 @@ static void picolcd_led_set_brightness(struct led_classdev *led_cdev, dev = led_cdev->dev->parent; hdev = container_of(dev, struct hid_device, dev); data = hid_get_drvdata(hdev); + if (!data) + return; for (i = 0; i < 8; i++) { if (led_cdev != data->led[i]) continue; |