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c9ce148ea7
snd_seq_client_use_ptr() is supposed to return the snd_seq_client object for the given client ID, and it tries to handle the module auto-loading when no matching object is found. Although the module handling is performed only conditionally with "!in_interrupt()", this condition may be fragile, e.g. when the code is called from the ALSA timer callback where the spinlock is temporarily disabled while the irq is disabled. Then his doesn't fit well and spews the error about sleep from invalid context, as complained recently by syzbot. Also, in general, handling the module-loading at each time if no matching object is found is really an overkill. It can be still useful when performed at the top-level ioctl or proc reads, but it shouldn't be done at event delivery at all. For addressing the issues above, this patch disables the module handling in snd_seq_client_use_ptr() in normal cases like event deliveries, but allow only in limited and safe situations. A new function client_load_and_use_ptr() is used for the cases where the module loading can be done safely, instead. Reported-by: syzbot+4cb9fad083898f54c517@syzkaller.appspotmail.com Closes: https://lore.kernel.org/67c272e5.050a0220.dc10f.0159.GAE@google.com Cc: <stable@vger.kernel.org> Link: https://patch.msgid.link/20250301114530.8975-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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|---|---|---|
| .. | ||
| oss | ||
| seq | ||
| .kunitconfig | ||
| compress_offload.c | ||
| control_compat.c | ||
| control_led.c | ||
| control.c | ||
| ctljack.c | ||
| device.c | ||
| hrtimer.c | ||
| hwdep_compat.c | ||
| hwdep.c | ||
| info_oss.c | ||
| info.c | ||
| init.c | ||
| isadma.c | ||
| jack.c | ||
| Kconfig | ||
| Makefile | ||
| memalloc.c | ||
| memory.c | ||
| misc.c | ||
| pcm_compat.c | ||
| pcm_dmaengine.c | ||
| pcm_drm_eld.c | ||
| pcm_iec958.c | ||
| pcm_lib.c | ||
| pcm_local.h | ||
| pcm_memory.c | ||
| pcm_misc.c | ||
| pcm_native.c | ||
| pcm_param_trace.h | ||
| pcm_timer.c | ||
| pcm_trace.h | ||
| pcm.c | ||
| rawmidi_compat.c | ||
| rawmidi.c | ||
| seq_device.c | ||
| sound_kunit.c | ||
| sound_oss.c | ||
| sound.c | ||
| timer_compat.c | ||
| timer.c | ||
| ump_convert.c | ||
| ump.c | ||
| vmaster.c | ||