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From: Markus Elfring <Markus.Elfring@web.de>
To: "Duoming Zhou" <duoming@zju.edu.cn>,
	linux-hams@vger.kernel.org, netdev@vger.kernel.org,
	kernel-janitors@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	"Eric Dumazet" <edumazet@google.com>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"Jörg Reuter" <jreuter@yaina.de>,
	"Paolo Abeni" <pabeni@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Dan Carpenter <dan.carpenter@linaro.org>,
	Lars Kellogg-Stedman <lars@oddbit.com>,
	Simon Horman <horms@kernel.org>
Subject: Re: [PATCH net v2 2/2] ax25: fix potential reference counting leak in ax25_addr_ax25dev
Date: Fri, 3 May 2024 09:30:33 +0200	[thread overview]
Message-ID: <6eac7fc4-9ade-41bb-a861-d7f339b388f6@web.de> (raw)
In-Reply-To: <74e840d98f2bfc79c6059993b2fc1ed3888faba4.1714690906.git.duoming@zju.edu.cn>

How do you think about to append parentheses to the function name
in the summary phrase?


> The reference counting of ax25_dev potentially increase more
> than once in ax25_addr_ax25dev(), which will cause memory leak.
>
> In order to fix the above issue, only increase the reference
> counting of ax25_dev once, when the res is not null.

Would you find the following change description a bit nicer?

   The reference counter of the object “ax25_dev” can be increased multiple times
   in ax25_addr_ax25dev(). This will cause a memory leak so far.

   Thus move a needed function call behind a for loop
   and increase the reference counter only when the local variable “res”
   is not a null pointer.


…
> +++ b/net/ax25/ax25_dev.c
> @@ -37,8 +37,9 @@ ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
…

Would you like to omit curly brackets in the affected function implementation?

Regards,
Markus

  reply	other threads:[~2024-05-03  7:36 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-02 23:36 [PATCH net v2 0/2] ax25: fix reference counting issue of ax25_dev Duoming Zhou
2024-05-02 23:36 ` [PATCH net v2 1/2] ax25: change kfree in ax25_dev_free to ax25_dev_free Duoming Zhou
2024-05-03  5:36   ` Markus Elfring
2024-05-03 11:33     ` Dan Carpenter
2024-05-02 23:36 ` [PATCH net v2 2/2] ax25: fix potential reference counting leak in ax25_addr_ax25dev Duoming Zhou
2024-05-03  7:30   ` Markus Elfring [this message]
2024-05-03 11:38     ` Dan Carpenter
2024-05-03 13:39       ` [v2 " Markus Elfring
2024-05-03  5:10 ` [PATCH net v2 0/2] ax25: fix reference counting issue of ax25_dev Dan Carpenter

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