diff options
| author | Julia Lawall <Julia.Lawall@lip6.fr> | 2018-07-01 19:32:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-03 17:01:45 -0700 |
| commit | ad04608260af5216d33ad74ada77bde42239b95d (patch) | |
| tree | 508d30ad4c8f902ef4d0e0d1687250aacd5fba36 /drivers/usb | |
| parent | b789ac6c8eb2f1eaec3bd05dd6420634e7ee6009 (diff) | |
usb: wusbcore: security: cast sizeof to int for comparison
[ Upstream commit d3ac5598c5010a8999978ebbcca3b1c6188ca36b ]
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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/wusbcore/security.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/wusbcore/security.c b/drivers/usb/wusbcore/security.c index 8c9421b69da0..6bf86ca950b3 100644 --- a/drivers/usb/wusbcore/security.c +++ b/drivers/usb/wusbcore/security.c @@ -230,7 +230,7 @@ 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; |