linux-kernel - Re: [PATCH] soc: qcom: pdr: Avoid uninitialized use of found in pdr_indication

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Date:   Mon, 16 Mar 2020 13:59:09 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] soc: qcom: pdr: Avoid uninitialized use of found in pdr_indication_cb

On Mon, Mar 16, 2020 at 1:49 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> Clang warns:
>
> ../drivers/soc/qcom/pdr_interface.c:316:2: warning: variable 'found' is
> used uninitialized whenever 'for' loop exits because its condition is
> false [-Wsometimes-uninitialized]
>         list_for_each_entry(pds, &pdr->lookups, node) {
>         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../include/linux/list.h:624:7: note: expanded from macro
> 'list_for_each_entry'
>              &pos->member != (head);
>              ^~~~~~~~~~~~~~~~~~~~~~
> ../drivers/soc/qcom/pdr_interface.c:325:7: note: uninitialized use
> occurs here
>         if (!found)
>              ^~~~~
> ../drivers/soc/qcom/pdr_interface.c:316:2: note: remove the condition if
> it is always true
>         list_for_each_entry(pds, &pdr->lookups, node) {
>         ^
> ../include/linux/list.h:624:7: note: expanded from macro
> 'list_for_each_entry'
>              &pos->member != (head);
>              ^
> ../drivers/soc/qcom/pdr_interface.c:309:12: note: initialize the
> variable 'found' to silence this warning
>         bool found;
>                   ^
>                    = 0
> 1 warning generated.
>
> Initialize found to false to fix this warning.
>
> Fixes: fbe639b44a82 ("soc: qcom: Introduce Protection Domain Restart helpers")
> Link: https://github.com/ClangBuiltLinux/linux/issues/933
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Yep, thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  drivers/soc/qcom/pdr_interface.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/soc/qcom/pdr_interface.c b/drivers/soc/qcom/pdr_interface.c
> index 7ee088b9cc7c..17ad3b8698e1 100644
> --- a/drivers/soc/qcom/pdr_interface.c
> +++ b/drivers/soc/qcom/pdr_interface.c
> @@ -306,7 +306,7 @@ static void pdr_indication_cb(struct qmi_handle *qmi,
>         const struct servreg_state_updated_ind *ind_msg = data;
>         struct pdr_list_node *ind;
>         struct pdr_service *pds;
> -       bool found;
> +       bool found = false;
>
>         if (!ind_msg || !ind_msg->service_path[0] ||
>             strlen(ind_msg->service_path) > SERVREG_NAME_LENGTH)
> --
> 2.26.0.rc1
>
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-- 
Thanks,
~Nick Desaulniers