linux-kernel - Re: [PATCH][next] i3c/master: Fix uninitialized variable next

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Message-ID: <nycvar.YSQ.7.78.906.2011241046530.2184@knanqh.ubzr>
Date:   Tue, 24 Nov 2020 10:48:00 -0500 (EST)
From:   Nicolas Pitre <npitre@...libre.com>
To:     Colin King <colin.king@...onical.com>
cc:     Boris Brezillon <bbrezillon@...nel.org>,
        linux-i3c@...ts.infradead.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] i3c/master: Fix uninitialized variable next_addr

On Tue, 24 Nov 2020, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>
> 
> The variable next_addr is not initialized and is being used in a call
> to i3c_master_get_free_addr as a starting point to find the next address.
> Fix this by initializing next_addr to 0 to avoid an uninitialized garbage
> starting address from being used.
> 
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: 9ad9a52cce28 ("i3c/master: introduce the mipi-i3c-hci driver")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Nicolas Pitre <npitre@...libre.com>





> ---
>  drivers/i3c/master/mipi-i3c-hci/cmd_v1.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c b/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c
> index 6dd234a82892..d97c3175e0e2 100644
> --- a/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c
> +++ b/drivers/i3c/master/mipi-i3c-hci/cmd_v1.c
> @@ -293,7 +293,7 @@ static int hci_cmd_v1_daa(struct i3c_hci *hci)
>  {
>  	struct hci_xfer *xfer;
>  	int ret, dat_idx = -1;
> -	u8 next_addr;
> +	u8 next_addr = 0;
>  	u64 pid;
>  	unsigned int dcr, bcr;
>  	DECLARE_COMPLETION_ONSTACK(done);
> -- 
> 2.29.2
> 
>