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Subject[PATCH AUTOSEL 3.18 1/4] Input: mousedev - add a schedule point in mousedev_write()
Date
From: Eric Dumazet <edumazet@google.com>

[ Upstream commit f74c371fe72a4f820d287db8067683fb533e4ede ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/mousedev.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index b604564dec5c..036acf861496 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -701,6 +701,7 @@ static ssize_t mousedev_write(struct file *file, const char __user *buffer,
mousedev_generate_response(client, c);

spin_unlock_irq(&client->packet_lock);
+ cond_resched();
}

kill_fasync(&client->fasync, SIGIO, POLL_IN);
--
2.17.1
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