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Input: mousedev - add a schedule point in mousedev_write() 

syzbot was able to trigger rcu stalls by calling write()
with large number of bytes.

Add a cond_resched() in the loop to avoid this.

Link: https://lkml.org/lkml/2018/8/23/1106
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot+9436b02171ac0894d33e@syzkaller.appspotmail.com
Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Eric Dumazet 2018-10-04 17:41:37 -07:00 committed by Dmitry Torokhov
parent 684bec1092
commit f74c371fe7
1 changed files with 1 additions and 0 deletions
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drivers/input/mousedev.c
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@ -707,6 +707,7 @@ static ssize_t mousedev_write(struct file *file, const char __user *buffer,
mousedev_generate_response(client, c); mousedev_generate_response(client, c);
spin_unlock_irq(&client->packet_lock); spin_unlock_irq(&client->packet_lock);
cond_resched();
} }
kill_fasync(&client->fasync, SIGIO, POLL_IN); kill_fasync(&client->fasync, SIGIO, POLL_IN);