From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 24 Nov 2020 18:10:13 +0000 (+0100)
Subject: 5.9-stable patches
X-Git-Tag: v4.4.247~52
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6d226ddea4b6f0a75376cdeeba7f8f4a04abddd2;p=thirdparty%2Fkernel%2Fstable-queue.git

5.9-stable patches

added patches:
	spi-bcm2835-fix-use-after-free-on-unbind.patch
---

diff --git a/queue-5.9/series b/queue-5.9/series
index bea91a17c40..8aceea7fb4f 100644
--- a/queue-5.9/series
+++ b/queue-5.9/series
@@ -1,3 +1,4 @@
 io_uring-get-an-active-ref_node-from-files_data.patch
 io_uring-order-refnode-recycling.patch
 spi-bcm-qspi-fix-use-after-free-on-unbind.patch
+spi-bcm2835-fix-use-after-free-on-unbind.patch
diff --git a/queue-5.9/spi-bcm2835-fix-use-after-free-on-unbind.patch b/queue-5.9/spi-bcm2835-fix-use-after-free-on-unbind.patch
new file mode 100644
index 00000000000..20a6708a564
--- /dev/null
+++ b/queue-5.9/spi-bcm2835-fix-use-after-free-on-unbind.patch
@@ -0,0 +1,87 @@
+From foo@baz Tue Nov 24 07:07:16 PM CET 2020
+From: Lukas Wunner <lukas@wunner.de>
+Date: Wed, 11 Nov 2020 20:07:20 +0100
+Subject: spi: bcm2835: Fix use-after-free on unbind
+
+From: Lukas Wunner <lukas@wunner.de>
+
+commit e1483ac030fb4c57734289742f1c1d38dca61e22 upstream
+
+bcm2835_spi_remove() accesses the driver's private data after calling
+spi_unregister_controller() even though that function releases the last
+reference on the spi_controller 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: f8043872e796 ("spi: add driver for BCM2835")
+Reported-by: Sascha Hauer <s.hauer@pengutronix.de>
+Reported-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: Lukas Wunner <lukas@wunner.de>
+Cc: <stable@vger.kernel.org> # v3.10+: 123456789abc: spi: Introduce device-managed SPI controller allocation
+Cc: <stable@vger.kernel.org> # v3.10+
+Cc: Vladimir Oltean <olteanv@gmail.com>
+Tested-by: Florian Fainelli <f.fainelli@gmail.com>
+Acked-by: Florian Fainelli <f.fainelli@gmail.com>
+Link: https://lore.kernel.org/r/ad66e0a0ad96feb848814842ecf5b6a4539ef35c.1605121038.git.lukas@wunner.de
+Signed-off-by: Mark Brown <broonie@kernel.org>
+Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/spi/spi-bcm2835.c |   27 ++++++++-------------------
+ 1 file changed, 8 insertions(+), 19 deletions(-)
+
+--- a/drivers/spi/spi-bcm2835.c
++++ b/drivers/spi/spi-bcm2835.c
+@@ -1278,7 +1278,7 @@ static int bcm2835_spi_probe(struct plat
+ 	struct bcm2835_spi *bs;
+ 	int err;
+ 
+-	ctlr = spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs),
++	ctlr = devm_spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs),
+ 						  dma_get_cache_alignment()));
+ 	if (!ctlr)
+ 		return -ENOMEM;
+@@ -1299,26 +1299,17 @@ static int bcm2835_spi_probe(struct plat
+ 	bs->ctlr = ctlr;
+ 
+ 	bs->regs = devm_platform_ioremap_resource(pdev, 0);
+-	if (IS_ERR(bs->regs)) {
+-		err = PTR_ERR(bs->regs);
+-		goto out_controller_put;
+-	}
++	if (IS_ERR(bs->regs))
++		return PTR_ERR(bs->regs);
+ 
+ 	bs->clk = devm_clk_get(&pdev->dev, NULL);
+-	if (IS_ERR(bs->clk)) {
+-		err = PTR_ERR(bs->clk);
+-		if (err == -EPROBE_DEFER)
+-			dev_dbg(&pdev->dev, "could not get clk: %d\n", err);
+-		else
+-			dev_err(&pdev->dev, "could not get clk: %d\n", err);
+-		goto out_controller_put;
+-	}
++	if (IS_ERR(bs->clk))
++		return dev_err_probe(&pdev->dev, PTR_ERR(bs->clk),
++				     "could not get clk\n");
+ 
+ 	bs->irq = platform_get_irq(pdev, 0);
+-	if (bs->irq <= 0) {
+-		err = bs->irq ? bs->irq : -ENODEV;
+-		goto out_controller_put;
+-	}
++	if (bs->irq <= 0)
++		return bs->irq ? bs->irq : -ENODEV;
+ 
+ 	clk_prepare_enable(bs->clk);
+ 
+@@ -1352,8 +1343,6 @@ out_dma_release:
+ 	bcm2835_dma_release(ctlr, bs);
+ out_clk_disable:
+ 	clk_disable_unprepare(bs->clk);
+-out_controller_put:
+-	spi_controller_put(ctlr);
+ 	return err;
+ }
+