Comment 3 for bug 278427

I was able to build the module with the attached patch. My kernel then oops when I modprobe snd_hda_intel.

My system:
root@emma:/usr/src# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu intrepid (development branch)
Release: 8.10
Codename: intrepid

linux-image-2.6.27-6-generic 2.6.27-6.9
alsa-source 1.0.17.dfsg-2ubuntu1

[26991.869241] HDA Intel 0000:00:1b.0: power state changed by ACPI to D0
[26991.869258] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[26991.869290] HDA Intel 0000:00:1b.0: setting latency timer to 64
[26991.968263] BUG: unable to handle kernel NULL pointer dereference at 00000000
[26991.968269] IP: [<c0254c5a>] vsnprintf+0x3a/0x7b0
[26991.968278] *pde = 00000000
[26991.968287] Oops: 0000 [#1] SMP
[26991.968293] Modules linked in: snd_hda_intel(+) snd_hwdep snd_pcm_oss snd_pcm snd_page_alloc snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore btusb bluetooth ipv6 af_packet i915 drm binfmt_misc sbs sbshc pci_slot nf_conntrack_ftp nf_conntrack_irc ipt_ULOG xt_limit xt_tcpudp xt_state nf_conntrack_ipv4 nf_conntrack iptable_filter ip_tables x_tables visor usbserial vboxdrv sbp2 lp loop usbhid pcmcia hid joydev arc4 ecb crypto_blkcipher iwl3945 rfkill parport_pc evdev parport mac80211 yenta_socket led_class rsrc_nonstatic psmouse video output pcmcia_core serio_raw cfg80211 container tpm_infineon tpm tpm_bios battery pcspkr ac button intel_agp agpgart wmi iTCO_wdt iTCO_vendor_support shpchp pci_hotplug ext3 jbd mbcache sr_mod cdrom ata_generic sd_mod crc_t10dif sg ata_piix pata_acpi ahci ohci1394 tg3 libata ieee1394 scsi_mod dock libphy ehci_hcd uhci_hcd usbcore dm_mirror dm_log dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit softcursor uvesafb fuse [last unloaded: soundcore]
[26991.968392]
[26991.968396] Pid: 11100, comm: modprobe Tainted: P (2.6.27-6-generic #1)
[26991.968399] EIP: 0060:[<c0254c5a>] EFLAGS: 00010292 CPU: 1
[26991.968404] EIP is at vsnprintf+0x3a/0x7b0
[26991.968406] EAX: dd1accb0 EBX: 00000000 ECX: 00000000 EDX: 00000014
[26991.968409] ESI: fffffff4 EDI: f7bfee80 EBP: f741bd44 ESP: f741bc20
[26991.968411] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[26991.968413] Process modprobe (pid: 11100, ti=f741a000 task=c1c13240 task.ti=f741a000)
[26991.968415] Stack: 00000000 00000400 f741bc44 0012654d 00000000 c1901fe0 c1901fe0 00000014
[26991.968423] dd1acc9c f741bc8c c0129f57 dd1accb0 f741bc78 c1c13240 f06ee480 f741bc84
[26991.968430] c0102df6 c1c1357c c1903980 f741bc8c c012848b c1905d00 dd495a40 00000001
[26991.968437] Call Trace:
[26991.968443] [<c0129f57>] ? load_balance_newidle+0x97/0x270
[26991.968455] [<c0102df6>] ? __switch_to+0xa6/0x160
[26991.968459] [<c012848b>] ? finish_task_switch+0x2b/0xe0
[26991.968463] [<c037dec9>] ? schedule+0x429/0x790
[26991.968467] [<c01052af>] ? mcount_call+0x5/0x16
[26991.968472] [<f8adf503>] ? snd_ctl_notify+0x23/0x1c0 [snd]
[26991.968484] [<c037fa41>] ? _spin_lock_irqsave+0x31/0x40
[26991.968488] [<c01ae03d>] ? unfreeze_slab+0x7d/0xc0
[26991.968493] [<c037fb5d>] ? _spin_lock+0xd/0x10
[26991.968497] [<c01ae1d4>] ? __slab_alloc+0xd4/0x260
[26991.968501] [<c02c3867>] ? device_create_vargs+0x57/0xc0
[26991.968506] [<c02c38b3>] ? device_create_vargs+0xa3/0xc0
[26991.968510] [<c02c38fd>] ? device_create+0x2d/0x30
[26991.968516] [<f8adcf8d>] ? snd_card_register+0xfd/0x320 [snd]
[26991.968525] [<f91b4afa>] ? snd_hda_build_controls+0x9c/0x9e [snd_hda_intel]
[26991.968540] [<f91b466a>] ? azx_probe+0x9aa/0xbc0 [snd_hda_intel]
[26991.968553] [<c0201bd8>] ? sysfs_add_one+0x18/0x50
[26991.968558] [<f9198350>] ? azx_get_response+0x0/0x240 [snd_hda_intel]
[26991.968568] [<f9197cf0>] ? azx_power_notify+0x0/0x90 [snd_hda_intel]
[26991.968581] [<c0264b7e>] ? pci_device_probe+0x5e/0x80
[26991.968587] [<c02c5709>] ? really_probe+0x59/0x190
[26991.968591] [<c0264386>] ? pci_match_device+0xc6/0xd0
[26991.968598] [<c02c5883>] ? driver_probe_device+0x43/0x60
[26991.968601] [<c02c5919>] ? __driver_attach+0x79/0x80
[26991.968606] [<c02c4fe3>] ? bus_for_each_dev+0x53/0x80
[26991.968610] [<c0264ac0>] ? pci_device_remove+0x0/0x40
[26991.968614] [<c02c55be>] ? driver_attach+0x1e/0x20
[26991.968618] [<c02c58a0>] ? __driver_attach+0x0/0x80
[26991.968622] [<c02c4987>] ? bus_add_driver+0x1b7/0x230
[26991.968627] [<c0264ac0>] ? pci_device_remove+0x0/0x40
[26991.968631] [<c02c5aee>] ? driver_register+0x6e/0x150
[26991.968636] [<f89c8000>] ? alsa_card_azx_init+0x0/0x1e [snd_hda_intel]
[26991.968648] [<c0264daf>] ? __pci_register_driver+0x4f/0x90
[26991.968652] [<f89c8000>] ? alsa_card_azx_init+0x0/0x1e [snd_hda_intel]
[26991.968662] [<f89c801c>] ? alsa_card_azx_init+0x1c/0x1e [snd_hda_intel]
[26991.968671] [<c0101120>] ? _stext+0x30/0x160
[26991.968680] [<c015c1c8>] ? sys_init_module+0x88/0x1b0
[26991.968685] [<c0103f7b>] ? sysenter_do_call+0x12/0x2f
[26991.968690] =======================
[26991.968692] Code: d2 89 85 fc fe ff ff 89 95 f8 fe ff ff 0f 88 5e 07 00 00 8b 85 fc fe ff ff 03 85 f8 fe ff ff 89 85 08 ff ff ff 0f 82 2e 03 00 00 <0f> b6 0b 8b b5 fc fe ff ff 84 c9 74 36 31 ff 80 f9 25 89 b5 04
[26991.968728] EIP: [<c0254c5a>] vsnprintf+0x3a/0x7b0 SS:ESP 0068:f741bc20
[26991.968739] ---[ end trace 1a121a1447b8167b ]---