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

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
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-01-08 13:58:31 +01:00
parent 898dfe4687
commit 29159a4ed7
1 changed files with 8 additions and 0 deletions
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8
sound/core/oss/pcm_oss.c
View File

@ -1381,6 +1381,10 @@ static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const cha
tmp != runtime->oss.period_bytes)
break;
}
if (signal_pending(current)) {
tmp = -ERESTARTSYS;
goto err;
}
}
mutex_unlock(&runtime->oss.params_lock);
return xfer;
@ -1466,6 +1470,10 @@ static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __use
bytes -= tmp;
xfer += tmp;
}
if (signal_pending(current)) {
tmp = -ERESTARTSYS;
goto err;
}
}
mutex_unlock(&runtime->oss.params_lock);
return xfer;