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* [PATCH] mmc: meson-gx: Free irq in release() callback
@ 2019-01-10 17:43 Remi Pommarel
  0 siblings, 0 replies; 3+ messages in thread
From: Remi Pommarel @ 2019-01-10 17:43 UTC (permalink / raw)
  To: Ulf Hansson, Kevin Hilman
  Cc: Elie Roudninski, linux-amlogic, Remi Pommarel, linux-mmc

Because the irq was requested through device managed resources API
(devm_request_threaded_irq()) it was freed after meson_mmc_remove()
completion, thus after mmc_free_host() has reclaimed meson_host memory.
As this irq is IRQF_SHARED, while using CONFIG_DEBUG_SHIRQ, its handler
get called by free_irq(). So meson_mmc_irq() was called after the
meson_host memory reclamation and was using invalid memory.

We ended up with the following scenario:
device_release_driver()
	meson_mmc_remove()
		mmc_free_host() /* Freeing host memory */
	...
	devres_release_all()
		devm_irq_release()
			__free_irq()
				meson_mmc_irq() /* Uses freed memory */

To avoid this, the irq is released in meson_mmc_remove() before
mmc_free_host() gets called.

This fixes https://marc.info/?l=linux-mmc&m=154707415208716.

Signed-off-by: Remi Pommarel <repk@triplefau.lt>
---
 drivers/mmc/host/meson-gx-mmc.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index c2690c1a50ff..412cfd16bf15 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -179,6 +179,8 @@ struct meson_host {
 	struct sd_emmc_desc *descs;
 	dma_addr_t descs_dma_addr;
 
+	int irq;
+
 	bool vqmmc_enabled;
 };
 
@@ -1231,7 +1233,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct meson_host *host;
 	struct mmc_host *mmc;
-	int ret, irq;
+	int ret;
 
 	mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
 	if (!mmc)
@@ -1276,8 +1278,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 		goto free_host;
 	}
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
+	host->irq = platform_get_irq(pdev, 0);
+	if (host->irq <= 0) {
 		dev_err(&pdev->dev, "failed to get interrupt resource.\n");
 		ret = -EINVAL;
 		goto free_host;
@@ -1331,9 +1333,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN,
 	       host->regs + SD_EMMC_IRQ_EN);
 
-	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
-					meson_mmc_irq_thread, IRQF_SHARED,
-					NULL, host);
+	ret = devm_request_threaded_irq(&pdev->dev, host->irq, meson_mmc_irq,
+			meson_mmc_irq_thread, IRQF_SHARED, NULL, host);
 	if (ret)
 		goto err_init_clk;
 
@@ -1387,6 +1388,7 @@ static int meson_mmc_remove(struct platform_device *pdev)
 
 	/* disable interrupts */
 	writel(0, host->regs + SD_EMMC_IRQ_EN);
+	devm_free_irq(host->dev, host->irq, host);
 
 	dma_free_coherent(host->dev, SD_EMMC_DESC_BUF_LEN,
 			  host->descs, host->descs_dma_addr);
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH] mmc: meson-gx: Free irq in release() callback
  2019-01-10 18:49 Remi Pommarel
@ 2019-01-10 22:52 ` Remi Pommarel
  0 siblings, 0 replies; 3+ messages in thread
From: Remi Pommarel @ 2019-01-10 22:52 UTC (permalink / raw)
  To: Ulf Hansson, Kevin Hilman
  Cc: Elie Roudninski, linux-amlogic, linux-mmc, linux-kernel

On Thu, Jan 10, 2019 at 07:49:08PM +0100, Remi Pommarel wrote:
> Because the irq was requested through device managed resources API
> (devm_request_threaded_irq()) it was freed after meson_mmc_remove()
> completion, thus after mmc_free_host() has reclaimed meson_host memory.
> As this irq is IRQF_SHARED, while using CONFIG_DEBUG_SHIRQ, its handler
> get called by free_irq(). So meson_mmc_irq() was called after the
> meson_host memory reclamation and was using invalid memory.
> 
> We ended up with the following scenario:
> device_release_driver()
> 	meson_mmc_remove()
> 		mmc_free_host() /* Freeing host memory */
> 	...
> 	devres_release_all()
> 		devm_irq_release()
> 			__free_irq()
> 				meson_mmc_irq() /* Uses freed memory */
> 
> To avoid this, the irq is released in meson_mmc_remove() before
> mmc_free_host() gets called.
> 

Oups, I missed the fact that the same can happen if probe() callback
fails after allocating the irq.

I will send a V2 for that.

-- 
Remi

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH] mmc: meson-gx: Free irq in release() callback
@ 2019-01-10 18:49 Remi Pommarel
  2019-01-10 22:52 ` Remi Pommarel
  0 siblings, 1 reply; 3+ messages in thread
From: Remi Pommarel @ 2019-01-10 18:49 UTC (permalink / raw)
  To: Ulf Hansson, Kevin Hilman
  Cc: Elie Roudninski, linux-amlogic, Remi Pommarel, linux-mmc, linux-kernel

Because the irq was requested through device managed resources API
(devm_request_threaded_irq()) it was freed after meson_mmc_remove()
completion, thus after mmc_free_host() has reclaimed meson_host memory.
As this irq is IRQF_SHARED, while using CONFIG_DEBUG_SHIRQ, its handler
get called by free_irq(). So meson_mmc_irq() was called after the
meson_host memory reclamation and was using invalid memory.

We ended up with the following scenario:
device_release_driver()
	meson_mmc_remove()
		mmc_free_host() /* Freeing host memory */
	...
	devres_release_all()
		devm_irq_release()
			__free_irq()
				meson_mmc_irq() /* Uses freed memory */

To avoid this, the irq is released in meson_mmc_remove() before
mmc_free_host() gets called.

This fixes https://marc.info/?l=linux-mmc&m=154707415208716.

Signed-off-by: Remi Pommarel <repk@triplefau.lt>
---
 drivers/mmc/host/meson-gx-mmc.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index c2690c1a50ff..412cfd16bf15 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -179,6 +179,8 @@ struct meson_host {
 	struct sd_emmc_desc *descs;
 	dma_addr_t descs_dma_addr;
 
+	int irq;
+
 	bool vqmmc_enabled;
 };
 
@@ -1231,7 +1233,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct meson_host *host;
 	struct mmc_host *mmc;
-	int ret, irq;
+	int ret;
 
 	mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
 	if (!mmc)
@@ -1276,8 +1278,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 		goto free_host;
 	}
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
+	host->irq = platform_get_irq(pdev, 0);
+	if (host->irq <= 0) {
 		dev_err(&pdev->dev, "failed to get interrupt resource.\n");
 		ret = -EINVAL;
 		goto free_host;
@@ -1331,9 +1333,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN,
 	       host->regs + SD_EMMC_IRQ_EN);
 
-	ret = devm_request_threaded_irq(&pdev->dev, irq, meson_mmc_irq,
-					meson_mmc_irq_thread, IRQF_SHARED,
-					NULL, host);
+	ret = devm_request_threaded_irq(&pdev->dev, host->irq, meson_mmc_irq,
+			meson_mmc_irq_thread, IRQF_SHARED, NULL, host);
 	if (ret)
 		goto err_init_clk;
 
@@ -1387,6 +1388,7 @@ static int meson_mmc_remove(struct platform_device *pdev)
 
 	/* disable interrupts */
 	writel(0, host->regs + SD_EMMC_IRQ_EN);
+	devm_free_irq(host->dev, host->irq, host);
 
 	dma_free_coherent(host->dev, SD_EMMC_DESC_BUF_LEN,
 			  host->descs, host->descs_dma_addr);
-- 
2.20.1


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linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic

^ permalink raw reply	[flat|nested] 3+ messages in thread

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2019-01-10 17:43 [PATCH] mmc: meson-gx: Free irq in release() callback Remi Pommarel
2019-01-10 18:49 Remi Pommarel
2019-01-10 22:52 ` Remi Pommarel

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