From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5274B17AAD for ; Wed, 9 Aug 2023 11:35:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3CCAC433C8; Wed, 9 Aug 2023 11:35:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691580946; bh=fFX6xU/lXcx76v/mkdy5C0sIlHizp3MN2/O1Zqq4yn4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o3dJX4Jkt3YujiwimVYLhgV5u8fqrsweeSEHG3gKIN+DZq2QL9RTe+ksGx1OI/zHm LLvWHu/w3kkKp/4yNS7FtzN456TrWFJCt61RoasMKWHcPT/NvYsYHMn9S+Yp5NjWXj TBdJxS6ucry+37r/tqZhhFfk5mTQRP4PJ6DI85vU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Martin Blumenstingl , Heiner Kallweit , Thierry Reding , Sasha Levin Subject: [PATCH 5.10 021/201] pwm: meson: fix handling of period/duty if greater than UINT_MAX Date: Wed, 9 Aug 2023 12:40:23 +0200 Message-ID: <20230809103644.533359998@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103643.799166053@linuxfoundation.org> References: <20230809103643.799166053@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Heiner Kallweit [ Upstream commit 87a2cbf02d7701255f9fcca7e5bd864a7bb397cf ] state->period/duty are of type u64, and if their value is greater than UINT_MAX, then the cast to uint will cause problems. Fix this by changing the type of the respective local variables to u64. Fixes: b79c3670e120 ("pwm: meson: Don't duplicate the polarity internally") Cc: stable@vger.kernel.org Suggested-by: Uwe Kleine-König Reviewed-by: Martin Blumenstingl Signed-off-by: Heiner Kallweit Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin --- drivers/pwm/pwm-meson.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index d3d9767aeb455..5b5fd16713501 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -163,8 +163,9 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, const struct pwm_state *state) { struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm]; - unsigned int duty, period, pre_div, cnt, duty_cnt; + unsigned int pre_div, cnt, duty_cnt; unsigned long fin_freq; + u64 duty, period; duty = state->duty_cycle; period = state->period; @@ -186,19 +187,19 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq); - pre_div = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * 0xffffLL); + pre_div = div64_u64(fin_freq * period, NSEC_PER_SEC * 0xffffLL); if (pre_div > MISC_CLK_DIV_MASK) { dev_err(meson->chip.dev, "unable to get period pre_div\n"); return -EINVAL; } - cnt = div64_u64(fin_freq * (u64)period, NSEC_PER_SEC * (pre_div + 1)); + cnt = div64_u64(fin_freq * period, NSEC_PER_SEC * (pre_div + 1)); if (cnt > 0xffff) { dev_err(meson->chip.dev, "unable to get period cnt\n"); return -EINVAL; } - dev_dbg(meson->chip.dev, "period=%u pre_div=%u cnt=%u\n", period, + dev_dbg(meson->chip.dev, "period=%llu pre_div=%u cnt=%u\n", period, pre_div, cnt); if (duty == period) { @@ -211,14 +212,13 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm, channel->lo = cnt; } else { /* Then check is we can have the duty with the same pre_div */ - duty_cnt = div64_u64(fin_freq * (u64)duty, - NSEC_PER_SEC * (pre_div + 1)); + duty_cnt = div64_u64(fin_freq * duty, NSEC_PER_SEC * (pre_div + 1)); if (duty_cnt > 0xffff) { dev_err(meson->chip.dev, "unable to get duty cycle\n"); return -EINVAL; } - dev_dbg(meson->chip.dev, "duty=%u pre_div=%u duty_cnt=%u\n", + dev_dbg(meson->chip.dev, "duty=%llu pre_div=%u duty_cnt=%u\n", duty, pre_div, duty_cnt); channel->pre_div = pre_div; -- 2.39.2