linux-kernel - Re: [PATCH] ubifs: ensure zero err is returned on successful return

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Date:   Fri, 16 Dec 2016 14:38:28 +0100
From:   Richard Weinberger <richard@....at>
To:     Colin King <colin.king@...onical.com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ubifs: ensure zero err is returned on successful return

On 16.12.2016 14:32, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> err is no longer being set on a successful return path, causing
> a garbage value being returned. Fix this by setting err to zero
> for the successful return path.
> 
> Found with static analysis by CoverityScan, CID 1389473
> 
> Fixes: 7799953b34d18 ("ubifs: Implement encrypt/decrypt for all IO")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  fs/ubifs/journal.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
> index a459211..b75f1a6 100644
> --- a/fs/ubifs/journal.c
> +++ b/fs/ubifs/journal.c
> @@ -1319,6 +1319,7 @@ static int truncate_data_node(const struct ubifs_info *c, const struct inode *in
>  	dn->compr_type = cpu_to_le16(compr_type);
>  	dn->size = cpu_to_le32(*new_len);
>  	*new_len = UBIFS_DATA_NODE_SZ + out_len;
> +	err = 0;
>  out:
>  	kfree(buf);
>  	return err;
> 

Good catch!

Thanks,
//richard