• Antonio Ospite's avatar
    [media] gspca-ov534: don't call sd_start() from sd_init() · d48de1c7
    Antonio Ospite authored
    sd_start() operates on device controls but after the conversion to the
    v4l2 control framework in commits 62bba5dd and 1bd7d6ad 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: default avatarAntonio Ospite <ospite@studenti.unina.it>
    Tested-by: default avatarYaroslav Zakharuk <slavikz@gmail.com>
    Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
    d48de1c7
ov534.c 36.3 KB