diff options
| author | Julia Lawall <Julia.Lawall@lip6.fr> | 2014-11-30 18:03:49 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-12-02 16:15:02 -0800 |
| commit | eb94ec7a6516cd1dc52c0f63d7c3a274e6337416 (patch) | |
| tree | dea11e9e5f49de50fbb38e982b3fad742b90d7d4 /drivers/usb | |
| parent | b19e5f04cd628c012c26a025cf93da5233df134d (diff) | |
wusb: replace memset by memzero_explicit
Memset on a local variable may be removed when it is called just before the
variable goes out of scope. Using memzero_explicit defeats this
optimization. A simplified version of the semantic patch that makes this
change is as follows: (http://coccinelle.lip6.fr/)
// <smpl>
@@
identifier x;
type T;
@@
{
... when any
T x[...];
... when any
when exists
- memset
+ memzero_explicit
(x,
-0,
...)
... when != x
when strict
}
// </smpl>
This change was suggested by Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/wusbcore/dev-sysfs.c | 2 | ||||
| -rw-r--r-- | drivers/usb/wusbcore/security.c | 8 |
2 files changed, 5 insertions, 5 deletions
diff --git a/drivers/usb/wusbcore/dev-sysfs.c b/drivers/usb/wusbcore/dev-sysfs.c index 101834576236..415b14002a61 100644 --- a/drivers/usb/wusbcore/dev-sysfs.c +++ b/drivers/usb/wusbcore/dev-sysfs.c @@ -101,7 +101,7 @@ static ssize_t wusb_ck_store(struct device *dev, if (wusbhc == NULL) return -ENODEV; result = wusb_dev_4way_handshake(wusbhc, usb_dev->wusb_dev, &ck); - memset(&ck, 0, sizeof(ck)); + memzero_explicit(&ck, sizeof(ck)); wusbhc_put(wusbhc); return result < 0 ? result : size; } diff --git a/drivers/usb/wusbcore/security.c b/drivers/usb/wusbcore/security.c index cc74d669c802..b66faaf3e842 100644 --- a/drivers/usb/wusbcore/security.c +++ b/drivers/usb/wusbcore/security.c @@ -522,10 +522,10 @@ error_hs3: error_hs2: error_hs1: memset(hs, 0, 3*sizeof(hs[0])); - memset(&keydvt_out, 0, sizeof(keydvt_out)); - memset(&keydvt_in, 0, sizeof(keydvt_in)); - memset(&ccm_n, 0, sizeof(ccm_n)); - memset(mic, 0, sizeof(mic)); + memzero_explicit(&keydvt_out, sizeof(keydvt_out)); + memzero_explicit(&keydvt_in, sizeof(keydvt_in)); + memzero_explicit(&ccm_n, sizeof(ccm_n)); + memzero_explicit(mic, sizeof(mic)); if (result < 0) wusb_dev_set_encryption(usb_dev, 0); error_dev_set_encryption: |