From: Kalle Valo <kvalo@kernel.org>
To: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Cc: pizza@shaftnet.org, davem@davemloft.net, kuba@kernel.org,
pabeni@redhat.com, linville@tuxdriver.com,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Xiaomeng Tong <xiam0nd.tong@gmail.com>
Subject: Re: [PATCH v3] cw1200: fix incorrect check to determine if no element is found in list
Date: Tue, 27 Sep 2022 06:08:39 +0000 (UTC) [thread overview]
Message-ID: <166425891751.10854.17954228621330378644.kvalo@kernel.org> (raw)
In-Reply-To: <20220413091723.17596-1-xiam0nd.tong@gmail.com>
Xiaomeng Tong <xiam0nd.tong@gmail.com> wrote:
> The bug is here: "} else if (item) {".
>
> The list iterator value will *always* be set and non-NULL by
> list_for_each_entry(), so it is incorrect to assume that the iterator
> value will be NULL if the list is empty or no element is found in list.
>
> Use a new value 'iter' as the list iterator, while use the old value
> 'item' as a dedicated pointer to point to the found element, which
> 1. can fix this bug, due to now 'item' is NULL only if it's not found.
> 2. do not need to change all the uses of 'item' after the loop.
> 3. can also limit the scope of the list iterator 'iter' *only inside*
> the traversal loop by simply declaring 'iter' inside the loop in the
> future, as usage of the iterator outside of the list_for_each_entry
> is considered harmful. https://lkml.org/lkml/2022/2/17/1032
>
> Fixes: a910e4a94f692 ("cw1200: add driver for the ST-E CW1100 & CW1200 WLAN chipsets")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Patch applied to wireless-next.git, thanks.
86df5de5c632 cw1200: fix incorrect check to determine if no element is found in list
--
https://patchwork.kernel.org/project/linux-wireless/patch/20220413091723.17596-1-xiam0nd.tong@gmail.com/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
prev parent reply other threads:[~2022-09-27 6:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-13 9:17 [PATCH v3] cw1200: fix incorrect check to determine if no element is found in list Xiaomeng Tong
2022-04-23 12:39 ` Kalle Valo
2022-05-09 11:39 ` Kalle Valo
2022-09-27 6:08 ` Kalle Valo [this message]
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