From: Ard Biesheuvel <ardb@kernel.org> To: linux-arm-kernel@lists.infradead.org Cc: Ard Biesheuvel <ardb@kernel.org>, Thara Gopinath <thara.gopinath@linaro.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, Andy Gross <agross@kernel.org>, linux-arm-msm@vger.kernel.org Subject: [PATCH] cpufreq: qcom-cpufreq-hw: Avoid stack buffer for IRQ name Date: Wed, 1 Sep 2021 10:47:32 +0200 [thread overview] Message-ID: <20210901084732.943248-1-ardb@kernel.org> (raw) Registering an IRQ requires the string buffer containing the name to remain allocated, as the name is not copied into another buffer. So let's add a irq_name field to the data struct instead, which is guaranteed to have the appropriate lifetime. Cc: Thara Gopinath <thara.gopinath@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Andy Gross <agross@kernel.org> Cc: linux-arm-msm@vger.kernel.org Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- I'm not following msm development closely, so apologies if this was already fixed, or if this is not based on the right tree. This fixes a crash on my Yoga C630 when reading /proc/interrupts. drivers/cpufreq/qcom-cpufreq-hw.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 3cc27d9e2ed1..6613228fe68c 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -44,6 +44,7 @@ struct qcom_cpufreq_data { /* Lock to synchronize between de-init sequence and re-starting LMh polling/interrupts */ spinlock_t throttle_lock; int throttle_irq; + char irq_name[15]; bool cancel_throttle; }; @@ -371,7 +372,6 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) { struct qcom_cpufreq_data *data = policy->driver_data; struct platform_device *pdev = cpufreq_get_driver_data(); - char irq_name[15]; int ret; /* @@ -388,11 +388,11 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) spin_lock_init(&data->throttle_lock); INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll); - snprintf(irq_name, sizeof(irq_name), "dcvsh-irq-%u", policy->cpu); + snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu); ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq, - IRQF_ONESHOT, irq_name, data); + IRQF_ONESHOT, data->irq_name, data); if (ret) { - dev_err(&pdev->dev, "Error registering %s: %d\n", irq_name, ret); + dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret); return 0; } -- 2.30.2
WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org> To: linux-arm-kernel@lists.infradead.org Cc: Ard Biesheuvel <ardb@kernel.org>, Thara Gopinath <thara.gopinath@linaro.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, Andy Gross <agross@kernel.org>, linux-arm-msm@vger.kernel.org Subject: [PATCH] cpufreq: qcom-cpufreq-hw: Avoid stack buffer for IRQ name Date: Wed, 1 Sep 2021 10:47:32 +0200 [thread overview] Message-ID: <20210901084732.943248-1-ardb@kernel.org> (raw) Registering an IRQ requires the string buffer containing the name to remain allocated, as the name is not copied into another buffer. So let's add a irq_name field to the data struct instead, which is guaranteed to have the appropriate lifetime. Cc: Thara Gopinath <thara.gopinath@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Andy Gross <agross@kernel.org> Cc: linux-arm-msm@vger.kernel.org Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- I'm not following msm development closely, so apologies if this was already fixed, or if this is not based on the right tree. This fixes a crash on my Yoga C630 when reading /proc/interrupts. drivers/cpufreq/qcom-cpufreq-hw.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 3cc27d9e2ed1..6613228fe68c 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -44,6 +44,7 @@ struct qcom_cpufreq_data { /* Lock to synchronize between de-init sequence and re-starting LMh polling/interrupts */ spinlock_t throttle_lock; int throttle_irq; + char irq_name[15]; bool cancel_throttle; }; @@ -371,7 +372,6 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) { struct qcom_cpufreq_data *data = policy->driver_data; struct platform_device *pdev = cpufreq_get_driver_data(); - char irq_name[15]; int ret; /* @@ -388,11 +388,11 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) spin_lock_init(&data->throttle_lock); INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll); - snprintf(irq_name, sizeof(irq_name), "dcvsh-irq-%u", policy->cpu); + snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu); ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq, - IRQF_ONESHOT, irq_name, data); + IRQF_ONESHOT, data->irq_name, data); if (ret) { - dev_err(&pdev->dev, "Error registering %s: %d\n", irq_name, ret); + dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret); return 0; } -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-09-01 8:47 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-01 8:47 Ard Biesheuvel [this message] 2021-09-01 8:47 ` [PATCH] cpufreq: qcom-cpufreq-hw: Avoid stack buffer for IRQ name Ard Biesheuvel 2021-09-01 10:59 ` Steev Klimaszewski 2021-09-01 10:59 ` Steev Klimaszewski 2021-09-01 19:22 ` Thara Gopinath 2021-09-01 19:22 ` Thara Gopinath 2021-12-20 10:12 ` Loic Poulain 2021-12-20 10:12 ` Loic Poulain 2021-12-20 23:43 ` Bjorn Andersson 2021-12-20 23:43 ` Bjorn Andersson
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