linux-kernel - [PATCH] usb: gadget: atmel_usba: fix crash when no endpoint are specified

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Date:	Thu, 27 Feb 2014 16:42:13 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Felipe Balbi <balbi@...com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org, Nicolas Ferre <nicolas.ferre@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] usb: gadget: atmel_usba: fix crash when no endpoint are specified

If no endpoints are present in the device tree, the kernel will cras hwith the
following error:

Unable to handle kernel paging request at virtual address 00101008
[...]
[<c0222ff4>] (composite_dev_prepare) from [<c022326c>] (composite_bind+0x5c/0x190)
[<c022326c>] (composite_bind) from [<c021ff8c>] (udc_bind_to_driver+0x48/0xf0)
[<c021ff8c>] (udc_bind_to_driver) from [<c02208e0>] (usb_gadget_probe_driver+0x7c/0xa0)
[<c02208e0>] (usb_gadget_probe_driver) from [<c0008970>] (do_one_initcall+0x94/0x140)
[<c0008970>] (do_one_initcall) from [<c04b4b50>] (kernel_init_freeable+0xec/0x1b4)
[<c04b4b50>] (kernel_init_freeable) from [<c0376cc4>] (kernel_init+0x8/0xe4)
[<c0376cc4>] (kernel_init) from [<c0009590>] (ret_from_fork+0x14/0x24)
Code: e5950014 e1a04001 e5902008 e3a010d0 (e5922008)
---[ end trace 35c74bdd89b373d0 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

This checks for that case and returns an error, not allowing the driver to be
loaded with no endpoints.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/usb/gadget/atmel_usba_udc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 52771d4c44bc..e3e0c8ff242e 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -1914,6 +1914,12 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
 		i++;
 	}
 
+	if (i == 0) {
+		dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
 	return eps;
 err:
 	return ERR_PTR(ret);
-- 
1.8.3.2

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