linux-kernel - Re: [PATCH] netlink: put module reference if dump start fails

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Message-ID: <1519192048.55655.35.camel@gmail.com>
Date:   Tue, 20 Feb 2018 21:47:28 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>, davem@...emloft.net,
        johannes.berg@...el.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netlink: put module reference if dump start fails

On Wed, 2018-02-21 at 04:41 +0100, Jason A. Donenfeld wrote:
> Before, if cb->start() failed, the module reference would never be put,
> because cb->cb_running is intentionally false at this point. Users are
> generally annoyed by this because they can no longer unload modules that
> leak references. Also, it may be possible to tediously wrap a reference
> counter back to zero, especially since module.c still uses atomic_inc
> instead of refcount_inc.
> 
> This patch expands the error path to simply call module_put if
> cb->start() fails.
> 
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
> This probably should be queued up for stable.

When was the bug added ? This would help a lot stable teams ...

Thanks.