linux-kernel - Re: [PATCH] interconnect: qcom: icc-rpm: Set the count member before accessing the flex array

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Message-ID: <aLG2jl7bwYVEoumO@stanley.mountain>
Date: Fri, 29 Aug 2025 17:17:50 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: stable@...r.kernel.org
Cc: djakov@...nel.org, naresh.kamboju@...aro.org, lkft@...aro.org,
	nathan@...nel.org, kees@...nel.org, konradybcio@...nel.org,
	quic_okukatla@...cinc.com, quic_rlaggysh@...cinc.com,
	linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] interconnect: qcom: icc-rpm: Set the count member before
 accessing the flex array

Hi Greg,

Could you pick up this commit for 6.12 and 6.6:

00a973e093e9 ("interconnect: qcom: icc-rpm: Set the count member before accessing the flex array")

It just silences a UBSan warning so it doesn't affect regular users, but
it helps in testing to silence those warnings.  It is a clean cherry-pick.

regards,
dan carpenter


On Wed, Dec 04, 2024 at 12:33:34AM +0200, djakov@...nel.org wrote:
> From: Georgi Djakov <djakov@...nel.org>
> 
> The following UBSAN error is reported during boot on the db410c board on
> a clang-19 build:
> 
> Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP
> ...
> pc : qnoc_probe+0x5f8/0x5fc
> ...
> 
> The cause of the error is that the counter member was not set before
> accessing the annotated flexible array member, but after that. Fix this
> by initializing it earlier.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Closes: https://lore.kernel.org/r/CA+G9fYs+2mBz1y2dAzxkj9-oiBJ2Acm1Sf1h2YQ3VmBqj_VX2g@mail.gmail.com
> Fixes: dd4904f3b924 ("interconnect: qcom: Annotate struct icc_onecell_data with __counted_by")
> Signed-off-by: Georgi Djakov <djakov@...nel.org>
> ---
>  drivers/interconnect/qcom/icc-rpm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
> index a8ed435f696c..ea1042d38128 100644
> --- a/drivers/interconnect/qcom/icc-rpm.c
> +++ b/drivers/interconnect/qcom/icc-rpm.c
> @@ -503,6 +503,7 @@ int qnoc_probe(struct platform_device *pdev)
>  			    GFP_KERNEL);
>  	if (!data)
>  		return -ENOMEM;
> +	data->num_nodes = num_nodes;
>  
>  	qp->num_intf_clks = cd_num;
>  	for (i = 0; i < cd_num; i++)
> @@ -597,7 +598,6 @@ int qnoc_probe(struct platform_device *pdev)
>  
>  		data->nodes[i] = node;
>  	}
> -	data->num_nodes = num_nodes;
>  
>  	clk_bulk_disable_unprepare(qp->num_intf_clks, qp->intf_clks);
>