linux-kernel - [PATCH v2] usb: Remove stack VLA usage

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Message-Id: <1520575874-15281-1-git-send-email-me@tobin.cc>
Date:   Fri,  9 Mar 2018 17:11:14 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Tobin C. Harding" <me@...in.cc>,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, Tycho Andersen <tycho@...ho.ws>,
        Kees Cook <keescook@...omium.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH v2] usb: Remove stack VLA usage

The kernel would like to have all stack VLA usage removed[1].  We
already have a pre-processor constant defined MAX_SGLEN.  We can use
this instead of the variable param-sglen.

[1]: https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Tobin C. Harding <me@...in.cc>
---
 drivers/usb/misc/usbtest.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 90028ef541e3..9e1142b8b91b 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -2028,11 +2028,14 @@ test_queue(struct usbtest_dev *dev, struct usbtest_param_32 *param,
 	unsigned		i;
 	unsigned long		packets = 0;
 	int			status = 0;
-	struct urb		*urbs[param->sglen];
+	struct urb		*urbs[MAX_SGLEN];
 
 	if (!param->sglen || param->iterations > UINT_MAX / param->sglen)
 		return -EINVAL;
 
+	if (param->sglen > MAX_SGLEN)
+		return -EINVAL;
+
 	memset(&context, 0, sizeof(context));
 	context.count = param->iterations * param->sglen;
 	context.dev = dev;
-- 
2.7.4