linux-kernel - Re: [PATCH] printk: ringbuffer: fix line counting

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Date:   Fri, 15 Jan 2021 12:30:19 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printk: ringbuffer: fix line counting

On Wed 2021-01-13 15:48:34, John Ogness wrote:
> Counting text lines in a record simply involves counting the number
> of newline characters (+1). However, it is searching the full data
> block for newline characters, even though the text data can be (and
> often is) a subset of that area. Since the extra area in the data
> block was never initialized, the result is that extra newlines may
> be seen and counted.
> 
> Restrict newline searching to the text data length.
> 
> Fixes: b6cf8b3f3312 ("printk: add lockless ringbuffer")
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

The patch is committed in printk/linux.git, branch printk-rework.

I plan to send it for-5.11 the following week after it spends
few days in linux-next.

Best Regards,
Petr