linux-kernel - Re: [PATCH] ubifs: Fix memleak in ubifs_init

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Date:   Tue, 5 Jan 2021 15:57:15 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, <kjlu@....edu>
CC:     Richard Weinberger <richard@....at>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ubifs: Fix memleak in ubifs_init_authentication

在 2021/1/5 14:03, Dinghao Liu 写道:
> When crypto_shash_digestsize() fails, c->hmac_tfm
> has not been freed before returning, which leads
> to memleak.
> 
> Fixes: 49525e5eecca5 ("ubifs: Add helper functions for authentication support")
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Reviewed-by: Zhihao Cheng <chengzhihao1@...wei.com>
> ---
>   fs/ubifs/auth.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
> index 51a7c8c2c3f0..e564d5ff8781 100644
> --- a/fs/ubifs/auth.c
> +++ b/fs/ubifs/auth.c
> @@ -327,7 +327,7 @@ int ubifs_init_authentication(struct ubifs_info *c)
>   		ubifs_err(c, "hmac %s is bigger than maximum allowed hmac size (%d > %d)",
>   			  hmac_name, c->hmac_desc_len, UBIFS_HMAC_ARR_SZ);
>   		err = -EINVAL;
> -		goto out_free_hash;
> +		goto out_free_hmac;
>   	}
>   
>   	err = crypto_shash_setkey(c->hmac_tfm, ukp->data, ukp->datalen);
>