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usb: wusbcore: security: cast sizeof to int for comparison

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Comparing an int to a size, which is unsigned, causes the int to become
unsigned, giving the wrong result.  usb_get_descriptor can return a
negative error code.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
int x;
expression e,e1;
identifier f;
@@

*x = f(...);
... when != x = e1
    when != if (x < 0 || ...) { ... return ...; }
*x < sizeof(e)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julia Lawall 2018-07-01 19:32:04 +02:00 committed by Greg Kroah-Hartman
parent e9576fe8e6
commit d3ac5598c5
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/wusbcore/security.c
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@ -217,7 +217,7 @@ int wusb_dev_sec_add(struct wusbhc *wusbhc,
result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
0, secd, sizeof(*secd));
if (result < sizeof(*secd)) {
if (result < (int)sizeof(*secd)) {
dev_err(dev, "Can't read security descriptor or "
"not enough data: %d\n", result);
goto out;