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usb: misc: usbtest: Fix overflow in usbtest_do_ioctl() 

There used to be a test against "if (param->sglen > MAX_SGLEN)" but it
was removed during a refactor.  It leads to an integer overflow and a
stack overflow in test_queue() if we try to create a too large urbs[]
array on the stack.

There is a second integer overflow in test_queue() as well if
"param->iterations" is too high.  I don't immediately see that it's
harmful but I've added a check to prevent it and silence the static
checker warning.

Fixes: 18fc4ebdc7 ("usb: misc: usbtest: Remove timeval usage")
Acked-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Dan Carpenter 2017-09-30 11:15:29 +03:00 committed by Felipe Balbi
parent 29c7f3e68e
commit cb84f56861
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/misc/usbtest.c
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@ -1964,6 +1964,9 @@ test_queue(struct usbtest_dev *dev, struct usbtest_param_32 *param,
int status = 0;
struct urb *urbs[param->sglen];
if (!param->sglen || param->iterations > UINT_MAX / param->sglen)
return -EINVAL;
memset(&context, 0, sizeof(context));
context.count = param->iterations * param->sglen;
context.dev = dev;
@ -2087,6 +2090,8 @@ usbtest_do_ioctl(struct usb_interface *intf, struct usbtest_param_32 *param)
if (param->iterations <= 0)
return -EINVAL;
if (param->sglen > MAX_SGLEN)
return -EINVAL;
/*
* Just a bunch of test cases that every HCD is expected to handle.
*