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FAILED: patch "[PATCH] spi: spi-sh: Fix use-after-free on unbind" failed to apply to 4.4-stable tree

PATCH [email protected] 2 participants 2 messages Dec 28, 2020 – May 29, 2021

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#0 lore raw

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e77df3eca12be4b17f13cf9f215cff248c57d98f Mon Sep 17 00:00:00 2001
From: Lukas Wunner <[email protected]>
Date: Mon, 7 Dec 2020 09:17:04 +0100
Subject: [PATCH] spi: spi-sh: Fix use-after-free on unbind

spi_sh_remove() accesses the driver's private data after calling spi_unregister_master() even though that function releases the last reference on the spi_master and thereby frees the private data.

Fix by switching over to the new devm_spi_alloc_master() helper which keeps the private data accessible until the driver has unbound.

Fixes 680c1305e259 ("spi/spi_sh: use spi_unregister_master instead of spi_master_put in remove path")
Signed-off-by Lukas Wunner <[email protected]>
Cc <[email protected]> # v3.0+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc <[email protected]> # v3.0+
Cc Axel Lin <[email protected]>
Link https://lore.kernel.org/r/6d97628b536baf01d5e3e39db61108f84d44c8b2.1607286887.git.lukas@wunner.de open here
Signed-off-by Mark Brown <[email protected]>
drivers/spi/spi-sh.c +4 -9
index 20bdae5fdf3b..15123a8f41e1 100644
@@ -440,7 +440,7 @@ static int spi_sh_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
-	master = spi_alloc_master(&pdev->dev, sizeof(struct spi_sh_data));
+	master = devm_spi_alloc_master(&pdev->dev, sizeof(struct spi_sh_data));
 	if (master == NULL) {
 		dev_err(&pdev->dev, "spi_alloc_master error.\n");
 		return -ENOMEM;

@@ -458,16 +458,14 @@ static int spi_sh_probe(struct platform_device *pdev)
 		break;
 	default:
 		dev_err(&pdev->dev, "No support width\n");
-		ret = -ENODEV;
-		goto error1;
+		return -ENODEV;
 	}
 	ss->irq = irq;
 	ss->master = master;
 	ss->addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 	if (ss->addr == NULL) {
 		dev_err(&pdev->dev, "ioremap error.\n");
-		ret = -ENOMEM;
-		goto error1;
+		return -ENOMEM;
 	}
 	INIT_LIST_HEAD(&ss->queue);
 	spin_lock_init(&ss->lock);

@@ -477,7 +475,7 @@ static int spi_sh_probe(struct platform_device *pdev)
 	ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "request_irq error\n");
-		goto error1;
+		return ret;
 	}
 
 	master->num_chipselect = 2;

@@ -496,9 +494,6 @@ static int spi_sh_probe(struct platform_device *pdev)
 
  error3:
 	free_irq(irq, ss);
- error1:
-	spi_master_put(master);
-
 	return ret;
 }
#1 lore raw
Quoted 4 lines · On Mon, Dec 28, 2020 at 11:50:02AM +0100, [email protected] wrote:

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Here's the backport of e77df3eca12b to v4.4-stable.

-- >8 --
From: Lukas Wunner <[email protected]>
Date: Mon, 7 Dec 2020 09:17:04 +0100
Subject: [PATCH] spi: spi-sh: Fix use-after-free on unbind

commit e77df3eca12be4b17f13cf9f215cff248c57d98f upstream.

spi_sh_remove() accesses the driver's private data after calling spi_unregister_master() even though that function releases the last reference on the spi_master and thereby frees the private data.

Fix by switching over to the new devm_spi_alloc_master() helper which keeps the private data accessible until the driver has unbound.

Fixes 680c1305e259 ("spi/spi_sh: use spi_unregister_master instead of spi_master_put in remove path")
Signed-off-by Lukas Wunner <[email protected]>
Cc <[email protected]> # v3.0+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc <[email protected]> # v3.0+
Cc Axel Lin <[email protected]>
Link https://lore.kernel.org/r/6d97628b536baf01d5e3e39db61108f84d44c8b2.1607286887.git.lukas@wunner.de open here
Signed-off-by Mark Brown <[email protected]>
[lukas: backport to v4.4.270]
Signed-off-by Lukas Wunner <[email protected]>
---
 drivers/spi/spi-sh.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)
drivers/spi/spi-sh.c +4 -10
index 502501187c9e..f062ebb46e0e 100644
@@ -451,7 +451,7 @@ static int spi_sh_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	master = spi_alloc_master(&pdev->dev, sizeof(struct spi_sh_data));
+	master = devm_spi_alloc_master(&pdev->dev, sizeof(struct spi_sh_data));
 	if (master == NULL) {
 		dev_err(&pdev->dev, "spi_alloc_master error.\n");
 		return -ENOMEM;

@@ -469,16 +469,14 @@ static int spi_sh_probe(struct platform_device *pdev)
 		break;
 	default:
 		dev_err(&pdev->dev, "No support width\n");
-		ret = -ENODEV;
-		goto error1;
+		return -ENODEV;
 	}
 	ss->irq = irq;
 	ss->master = master;
 	ss->addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 	if (ss->addr == NULL) {
 		dev_err(&pdev->dev, "ioremap error.\n");
-		ret = -ENOMEM;
-		goto error1;
+		return -ENOMEM;
 	}
 	INIT_LIST_HEAD(&ss->queue);
 	spin_lock_init(&ss->lock);

@@ -488,8 +486,7 @@ static int spi_sh_probe(struct platform_device *pdev)
 					dev_name(master->dev.parent));
 	if (ss->workqueue == NULL) {
 		dev_err(&pdev->dev, "create workqueue error\n");
-		ret = -EBUSY;
-		goto error1;
+		return -EBUSY;
 	}
 
 	ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss);

@@ -516,9 +513,6 @@ static int spi_sh_probe(struct platform_device *pdev)
 	free_irq(irq, ss);
  error2:
 	destroy_workqueue(ss->workqueue);
- error1:
-	spi_master_put(master);
-
 	return ret;
 }
Signature · 1 line
2.31.1