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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2017-09-30 11:15:29 +0300 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-10-11 13:14:09 +0300 |
| commit | cb84f56861eb333af0a5bab475d741b13067c05c (patch) | |
| tree | d74aad2ca497cf19faeca8e6f9a6e3071ac46c3b | |
| parent | 29c7f3e68eec4ae94d85ad7b5dfdafdb8089f513 (diff) | |
| download | linux-cb84f56861eb333af0a5bab475d741b13067c05c.tar.gz linux-cb84f56861eb333af0a5bab475d741b13067c05c.tar.xz | |
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: 18fc4ebdc705 ("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>
| -rw-r--r-- | drivers/usb/misc/usbtest.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c index eee82ca55b7b..113e38bfe0ef 100644 --- a/drivers/usb/misc/usbtest.c +++ b/drivers/usb/misc/usbtest.c @@ -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. * |