forked from luck/tmp_suning_uos_patched
9017201e8d
commit bc55cfd5718c7c23e5524582e9fa70b4d10f2433 upstream.
syzbot caught a potential deadlock between the PCM
runtime->buffer_mutex and the mm->mmap_lock. It was brought by the
recent fix to cover the racy read/write and other ioctls, and in that
commit, I overlooked a (hopefully only) corner case that may take the
revert lock, namely, the OSS mmap. The OSS mmap operation
exceptionally allows to re-configure the parameters inside the OSS
mmap syscall, where mm->mmap_mutex is already held. Meanwhile, the
copy_from/to_user calls at read/write operations also take the
mm->mmap_lock internally, hence it may lead to a AB/BA deadlock.
A similar problem was already seen in the past and we fixed it with a
refcount (in commit
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| .. | ||
| ac97 | ||
| sof | ||
| ac97_codec.h | ||
| aci.h | ||
| ad1816a.h | ||
| ad1843.h | ||
| adau1373.h | ||
| ak4xxx-adda.h | ||
| ak4113.h | ||
| ak4114.h | ||
| ak4117.h | ||
| ak4531_codec.h | ||
| ak4641.h | ||
| alc5623.h | ||
| asequencer.h | ||
| asound.h | ||
| asoundef.h | ||
| compress_driver.h | ||
| control.h | ||
| core.h | ||
| cs35l33.h | ||
| cs35l34.h | ||
| cs35l35.h | ||
| cs35l36.h | ||
| cs42l52.h | ||
| cs42l56.h | ||
| cs42l73.h | ||
| cs4231-regs.h | ||
| cs4271.h | ||
| cs8403.h | ||
| cs8427.h | ||
| da7213.h | ||
| da7218.h | ||
| da7219-aad.h | ||
| da7219.h | ||
| da9055.h | ||
| designware_i2s.h | ||
| dmaengine_pcm.h | ||
| emu10k1_synth.h | ||
| emu10k1.h | ||
| emu8000_reg.h | ||
| emu8000.h | ||
| emux_legacy.h | ||
| emux_synth.h | ||
| es1688.h | ||
| gus.h | ||
| hda_chmap.h | ||
| hda_codec.h | ||
| hda_component.h | ||
| hda_hwdep.h | ||
| hda_i915.h | ||
| hda_register.h | ||
| hda_regmap.h | ||
| hda_verbs.h | ||
| hdaudio_ext.h | ||
| hdaudio.h | ||
| hdmi-codec.h | ||
| hwdep.h | ||
| i2c.h | ||
| info.h | ||
| initval.h | ||
| intel-dsp-config.h | ||
| intel-nhlt.h | ||
| jack.h | ||
| l3.h | ||
| madera-pdata.h | ||
| max9768.h | ||
| max98088.h | ||
| max98090.h | ||
| max98095.h | ||
| memalloc.h | ||
| minors.h | ||
| mixer_oss.h | ||
| mpu401.h | ||
| omap-hdmi-audio.h | ||
| opl3.h | ||
| opl4.h | ||
| pcm_drm_eld.h | ||
| pcm_iec958.h | ||
| pcm_oss.h | ||
| pcm_params.h | ||
| pcm-indirect.h | ||
| pcm.h | ||
| pt2258.h | ||
| pxa2xx-lib.h | ||
| rawmidi.h | ||
| rt286.h | ||
| rt298.h | ||
| rt1015.h | ||
| rt5514.h | ||
| rt5645.h | ||
| rt5659.h | ||
| rt5660.h | ||
| rt5663.h | ||
| rt5665.h | ||
| rt5668.h | ||
| rt5682.h | ||
| s3c24xx_uda134x.h | ||
| sb.h | ||
| sb16_csp.h | ||
| seq_device.h | ||
| seq_kernel.h | ||
| seq_midi_emul.h | ||
| seq_midi_event.h | ||
| seq_oss_legacy.h | ||
| seq_oss.h | ||
| seq_virmidi.h | ||
| sh_dac_audio.h | ||
| sh_fsi.h | ||
| simple_card_utils.h | ||
| simple_card.h | ||
| snd_wavefront.h | ||
| soc-acpi-intel-match.h | ||
| soc-acpi.h | ||
| soc-card.h | ||
| soc-component.h | ||
| soc-dai.h | ||
| soc-dapm.h | ||
| soc-dpcm.h | ||
| soc-link.h | ||
| soc-topology.h | ||
| soc.h | ||
| sof.h | ||
| soundfont.h | ||
| spear_dma.h | ||
| spear_spdif.h | ||
| sta32x.h | ||
| sta350.h | ||
| tas2552-plat.h | ||
| tas5086.h | ||
| tea6330t.h | ||
| timer.h | ||
| tlv.h | ||
| tlv320aic3x.h | ||
| tlv320aic32x4.h | ||
| tlv320dac33-plat.h | ||
| tpa6130a2-plat.h | ||
| uda134x.h | ||
| uda1380.h | ||
| util_mem.h | ||
| vx_core.h | ||
| wavefront.h | ||
| wm0010.h | ||
| wm1250-ev1.h | ||
| wm2000.h | ||
| wm2200.h | ||
| wm5100.h | ||
| wm8903.h | ||
| wm8904.h | ||
| wm8955.h | ||
| wm8960.h | ||
| wm8962.h | ||
| wm8993.h | ||
| wm8996.h | ||
| wm9081.h | ||
| wm9090.h | ||
| wss.h | ||