linux-sg2042/sound
Russell King a4461f41b9 ALSA: fix oops in snd_pcm_info() caused by ASoC DPCM
Unable to handle kernel NULL pointer dereference at virtual address 00000008
pgd = d5300000
[00000008] *pgd=0d265831, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1] PREEMPT ARM
CPU: 0 PID: 2295 Comm: vlc Not tainted 3.11.0+ #755
task: dee74800 ti: e213c000 task.ti: e213c000
PC is at snd_pcm_info+0xc8/0xd8
LR is at 0x30232065
pc : [<c031b52c>]    lr : [<30232065>]    psr: a0070013
sp : e213dea8  ip : d81cb0d0  fp : c05f7678
r10: c05f7770  r9 : fffffdfd  r8 : 00000000
r7 : d8a968a8  r6 : d8a96800  r5 : d8a96200  r4 : d81cb000
r3 : 00000000  r2 : d81cb000  r1 : 00000001  r0 : d8a96200
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c5387d  Table: 15300019  DAC: 00000015
Process vlc (pid: 2295, stack limit = 0xe213c248)
[<c031b52c>] (snd_pcm_info) from [<c031b570>] (snd_pcm_info_user+0x34/0x9c)
[<c031b570>] (snd_pcm_info_user) from [<c03164a4>] (snd_pcm_control_ioctl+0x274/0x280)
[<c03164a4>] (snd_pcm_control_ioctl) from [<c0311458>] (snd_ctl_ioctl+0xc0/0x55c)
[<c0311458>] (snd_ctl_ioctl) from [<c00eca84>] (do_vfs_ioctl+0x80/0x31c)
[<c00eca84>] (do_vfs_ioctl) from [<c00ecd5c>] (SyS_ioctl+0x3c/0x60)
[<c00ecd5c>] (SyS_ioctl) from [<c000e500>] (ret_fast_syscall+0x0/0x48)
Code: e1a00005 e59530dc e3a01001 e1a02004 (e5933008)
---[ end trace cb3d9bdb8dfefb3c ]---

This is provoked when the ASoC front end is open along with its backend,
(which causes the backend to have a runtime assigned to it) and then the
SNDRV_CTL_IOCTL_PCM_INFO is requested for the (visible) backend device.

Resolve this by ensuring that ASoC internal backend devices are not
visible to userspace, just as the commentry for snd_pcm_new_internal()
says it should be.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Mark Brown <broonie@linaro.org>
Cc: <stable@vger.kernel.org> [v3.4+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-10-31 17:36:47 +01:00
..
aoa ALSA: snd-aoa: Add a layout entry for PowerBook6,5 2013-05-16 07:19:01 +02:00
arm ASoC: pxa: use snd_dmaengine_dai_dma_data 2013-08-15 11:29:07 +01:00
atmel ALSA: atmel: Remove redundant platform_set_drvdata() 2013-05-03 11:40:23 +02:00
core ALSA: fix oops in snd_pcm_info() caused by ASoC DPCM 2013-10-31 17:36:47 +01:00
drivers ALSA: replace strict_strto*() with kstrto*() 2013-07-21 11:56:18 +02:00
firewire Merge branch 'for-3.12' into for-next 2013-07-15 12:09:28 +02:00
i2c [media] tea575x: Move from sound to media 2013-08-18 08:09:59 -03:00
isa Merge remote-tracking branch 'asoc/fix/fsl' into asoc-linus 2013-09-11 11:17:15 +01:00
mips ALSA: mips/sgio2audio: Remove redundant platform_set_drvdata() 2013-05-06 10:45:54 +02:00
oss ASoC: Updates for v3.12 2013-08-23 14:12:22 +02:00
parisc ALSA: Remove the rest of *_set_drvdata(NULL) calls 2013-05-29 12:50:59 +02:00
pci ALSA: hda - Add a fixup for ASUS N76VZ 2013-10-30 12:31:35 +01:00
pcmcia sound/pcmcia: use module_pcmcia_driver() in pcmcia drivers 2013-03-15 12:26:39 -07:00
ppc ALSA: powermac: Remove redundant platform_set_drvdata() 2013-05-23 14:35:58 +02:00
sh ALSA: sh_dac_audio: Remove redundant platform_set_drvdata() 2013-05-23 14:36:45 +02:00
soc Merge remote-tracking branch 'asoc/fix/wm8994' into asoc-linus 2013-10-30 10:11:55 -07:00
sparc ALSA: Remove the rest of *_set_drvdata(NULL) calls 2013-05-29 12:50:59 +02:00
spi ALSA: Remove the rest of *_set_drvdata(NULL) calls 2013-05-29 12:50:59 +02:00
synth
usb ALSA: us122l: Fix pcm_usb_stream mmapping regression 2013-10-15 11:35:54 +02:00
Kconfig sound: remove reference to feature-removal-schedule.txt 2012-12-17 17:15:12 -08:00
Makefile
ac97_bus.c
last.c
sound_core.c drivers: avoid format string in dev_set_name 2013-07-03 16:07:41 -07:00
sound_firmware.c sound_firmware: don't bother with filp_close() 2013-04-09 15:16:32 -04:00