From: Peter Maydell <peter.maydell@linaro.org>
To: QEMU Developers <qemu-devel@nongnu.org>
Cc: "Magnus Damm" <magnus.damm@gmail.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Yoshinori Sato" <ysato@users.sourceforge.jp>
Subject: Re: [PATCH for-6.0] hw/timer/renesas_tmr: Add default-case asserts in read_tcnt()
Date: Fri, 26 Mar 2021 13:34:39 +0000 [thread overview]
Message-ID: <CAFEAcA9hz5ZsetCWMGJd+aX0td6vE7YiAW+x2C=K3mCsdWiJ8w@mail.gmail.com> (raw)
In-Reply-To: <20210319162458.13760-1-peter.maydell@linaro.org>
ping for review?
thanks
-- PMM
On Fri, 19 Mar 2021 at 16:24, Peter Maydell <peter.maydell@linaro.org> wrote:
>
> In commit 81b3ddaf8772ec we fixed a use of uninitialized data
> in read_tcnt(). However this change wasn't enough to placate
> Coverity, which is not smart enough to see that if we read a
> 2 bit field and then handle cases 0, 1, 2 and 3 then there cannot
> be a flow of execution through the switch default. Add explicit
> default cases which assert that they can't be reached, which
> should help silence Coverity.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> hw/timer/renesas_tmr.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/hw/timer/renesas_tmr.c b/hw/timer/renesas_tmr.c
> index eed39917fec..d96002e1ee6 100644
> --- a/hw/timer/renesas_tmr.c
> +++ b/hw/timer/renesas_tmr.c
> @@ -146,6 +146,8 @@ static uint16_t read_tcnt(RTMRState *tmr, unsigned size, int ch)
> case CSS_CASCADING:
> tcnt[1] = tmr->tcnt[1];
> break;
> + default:
> + g_assert_not_reached();
> }
> switch (FIELD_EX8(tmr->tccr[0], TCCR, CSS)) {
> case CSS_INTERNAL:
> @@ -159,6 +161,8 @@ static uint16_t read_tcnt(RTMRState *tmr, unsigned size, int ch)
> case CSS_EXTERNAL: /* QEMU doesn't implement this */
> tcnt[0] = tmr->tcnt[0];
> break;
> + default:
> + g_assert_not_reached();
> }
> } else {
> tcnt[0] = tmr->tcnt[0];
> --
> 2.20.1
next prev parent reply other threads:[~2021-03-26 13:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-19 16:24 [PATCH for-6.0] hw/timer/renesas_tmr: Add default-case asserts in read_tcnt() Peter Maydell
2021-03-26 13:34 ` Peter Maydell [this message]
2021-03-26 18:49 ` Philippe Mathieu-Daudé
2021-03-29 17:03 ` Philippe Mathieu-Daudé
2021-03-29 17:55 ` Peter Maydell
2021-04-01 15:58 ` Yoshinori Sato
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