linux-kernel - Re: [PATCH] fjes: Check possible NULL pointer returned by vzalloc

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Message-ID: <20211229183320.5631b317@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Wed, 29 Dec 2021 18:33:20 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fjes: Check possible NULL pointer returned by vzalloc

On Wed, 29 Dec 2021 18:21:40 +0800 Jiasheng Jiang wrote:
> As the possible alloc failure of the vzalloc(), the 'hw->hw_info.trace'
> could be NULL pointer.
> Therefore it should be better to check it to guarantee the complete
> success of the initiation.
> 
> Fixes: 8cdc3f6c5d22 ("fjes: Hardware initialization routine")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/net/fjes/fjes_hw.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/fjes/fjes_hw.c b/drivers/net/fjes/fjes_hw.c
> index 065bb0a40b1d..4c83f637a135 100644
> --- a/drivers/net/fjes/fjes_hw.c
> +++ b/drivers/net/fjes/fjes_hw.c
> @@ -329,6 +329,9 @@ int fjes_hw_init(struct fjes_hw *hw)
>  	ret = fjes_hw_setup(hw);
>  
>  	hw->hw_info.trace = vzalloc(FJES_DEBUG_BUFFER_SIZE);
> +	if (!hw->hw_info.trace)
> +		return -ENOMEM;
> +
>  	hw->hw_info.trace_size = FJES_DEBUG_BUFFER_SIZE;
>  
>  	return ret;

The rest of this driver is clearly written expecting that
hw_info.trace may be NULL. This change is unnecessary at 
best and may even introduce a regression.

Please do bare minimum of sanity checking your patches.
Your submissions are consistently of very low quality.