Hi,
Thanks for the patch I've added this to my "gspca" tree, and this
will be included in my next pull-request to Mauro for 3.12
Regards,
Hans
On 08/15/2013 12:29 PM, Antonio Ospite wrote:
sd_start() operates on device controls but after the conversion to the
v4l2 control framework in commits 62bba5d and 1bd7d6a controls are
initialized in sd_init_controls() which is called _after_ sd_init():
The change fixes a NULL pointer dereference for Hercules Blog Webcam;
the problem is observable since 3.6:
gspca_main: v2.14.0 registered
gspca_main: ov534-2.14.0 probing 06f8:3002
BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
IP: [<ffffffffa03c1b01>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev]
PGD 0
Oops: 0000 [#1] SMP
Modules linked in: gspca_ov534(+) gspca_main videodev rfcomm bnep ppdev bluetooth binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek stir4200 irda crc_ccitt usblp snd_hda_intel snd_hda_codec snd_hwdep snd_pcm hid_generic snd_page_alloc snd_seq_midi snd_seq_midi_event usbhid snd_rawmidi snd_seq snd_seq_device snd_timer hid i915 snd psmouse drm_kms_helper serio_raw mei_me drm mei soundcore video i2c_algo_bit lpc_ich mac_hid coretemp lp parport firewire_ohci firewire_core crc_itu_t ahci libahci alx mdio r8169 mii [last unloaded: parport_pc]
CPU: 3 PID: 4352 Comm: modprobe Not tainted 3.11.0-031100rc2-generic #201307211535
Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z77-DS3H, BIOS F9 09/19/2012
task: ffff8801c20f9770 ti: ffff8801ceaa0000 task.ti: ffff8801ceaa0000
RIP: 0010:[<ffffffffa03c1b01>] [<ffffffffa03c1b01>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev]
RSP: 0018:ffff8801ceaa1af8 EFLAGS: 00010292
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 000000000001988b
RDX: 000000000001988a RSI: ffffffffa032745a RDI: 0000000000000000
RBP: ffff8801ceaa1b28 R08: 0000000000017380 R09: ffffea0008419d80
R10: ffffffff81538f5a R11: 0000000000000002 R12: ffffffffa03273dc
R13: ffffffffa03273dc R14: 0000000000000000 R15: ffffffffa03270a0
FS: 00007f72d564a740(0000) GS:ffff88021f380000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 00000001bd1f0000 CR4: 00000000001407e0
Stack:
ffff8801ceaa1b28 ffffffffa0325cff ffff8801000001f4 ffff8801ceb44000
ffffffffa03273dc ffff8801ceb44000 ffff8801ceaa1b58 ffffffffa032688e
ffff8801ceb44000 ffffffffa03274f0 ffffffffa03274f0 ffff8801ceb44380
Call Trace:
[<ffffffffa0325cff>] ? sccb_w_array+0x3f/0x80 [gspca_ov534]
[<ffffffffa032688e>] sd_start+0xce/0x2b0 [gspca_ov534]
[<ffffffffa0326bf9>] sd_init+0x189/0x1e8 [gspca_ov534]
[<ffffffffa02a0c95>] gspca_dev_probe2+0x285/0x410 [gspca_main]
[<ffffffffa02a0e58>] gspca_dev_probe+0x38/0x60 [gspca_main]
[<ffffffffa0325081>] sd_probe+0x21/0x30 [gspca_ov534]
[<ffffffff8153c960>] usb_probe_interface+0x1c0/0x2f0
[<ffffffff8148758c>] really_probe+0x6c/0x330
[<ffffffff814879d7>] driver_probe_device+0x47/0xa0
[<ffffffff81487adb>] __driver_attach+0xab/0xb0
[<ffffffff81487a30>] ? driver_probe_device+0xa0/0xa0
[<ffffffff814857be>] bus_for_each_dev+0x5e/0x90
[<ffffffff8148714e>] driver_attach+0x1e/0x20
[<ffffffff81486bdc>] bus_add_driver+0x10c/0x290
[<ffffffff8148805d>] driver_register+0x7d/0x160
[<ffffffff8153b590>] usb_register_driver+0xa0/0x160
[<ffffffffa0067000>] ? 0xffffffffa0066fff
[<ffffffffa006701e>] sd_driver_init+0x1e/0x1000 [gspca_ov534]
[<ffffffff8100212a>] do_one_initcall+0xfa/0x1b0
[<ffffffff810578c3>] ? set_memory_nx+0x43/0x50
[<ffffffff81712e8d>] do_init_module+0x80/0x1d1
[<ffffffff810d2079>] load_module+0x4c9/0x5f0
[<ffffffff810cf7b0>] ? add_kallsyms+0x210/0x210
[<ffffffff810d2254>] SyS_init_module+0xb4/0x100
[<ffffffff817333ef>] tracesys+0xe1/0xe6
Code: a0 09 00 00 48 c7 c7 30 c3 3c a0 e8 7a 38 ca e0 eb cf 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 28 <8b> 47 50 83 e8 05 83 f8 02 77 09 80 b8 20 8c 3c a0 00 74 1d 48
RIP [<ffffffffa03c1b01>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev]
RSP <ffff8801ceaa1af8>
CR2: 0000000000000050
---[ end trace 6786f15abfd2ac90 ]---
Original bug report from:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173723/
Signed-off-by: Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>
Tested-by: Yaroslav Zakharuk <slavikz@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 3.6+
---
drivers/media/usb/gspca/ov534.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/media/usb/gspca/ov534.c b/drivers/media/usb/gspca/ov534.c
index 2e28c81..03a33c4 100644
--- a/drivers/media/usb/gspca/ov534.c
+++ b/drivers/media/usb/gspca/ov534.c
@@ -1305,8 +1305,7 @@ static int sd_init(struct gspca_dev *gspca_dev)
ov534_set_led(gspca_dev, 1);
sccb_w_array(gspca_dev, sensor_init[sd->sensor].val,
sensor_init[sd->sensor].len);
- if (sd->sensor == SENSOR_OV767x)
- sd_start(gspca_dev);
+
sd_stopN(gspca_dev);
/* set_frame_rate(gspca_dev); */
--
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