ALSA: pcm: Abort properly at pending signal in OSS read/write loops

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commit 29159a4ed7 upstream.

The loops for read and write in PCM OSS emulation have no proper check
of pending signals, and they keep processing even after user tries to
break.  This results in a very long delay, often seen as RCU stall
when a huge unprocessed bytes remain queued.  The bug could be easily
triggered by syzkaller.

As a simple workaround, this patch adds the proper check of pending
signals and aborts the loop appropriately.

Reported-by: syzbot+993cb4cfcbbff3947c21@syzkaller.appspotmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Takashi Iwai 2018-01-08 13:58:31 +01:00 • committed by Greg Kroah-Hartman

parent 835004dc45

commit 28ac403265

1 changed files with 8 additions and 0 deletions

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sound/core/oss/pcm_oss.c

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