Staging: vt6656: add some range checks before memcpy()

We need to verify that we're not writing past the end of the array.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/staging/vt6656/ioctl.c b/drivers/staging/vt6656/ioctl.c
index 2cde4f0c046..49390026dea 100644
--- a/drivers/staging/vt6656/ioctl.c
+++ b/drivers/staging/vt6656/ioctl.c
@@ -81,6 +81,8 @@ int private_ioctl(PSDevice pDevice, struct ifreq *rq)
                 }
 
                 pItemSSID = (PWLAN_IE_SSID)sScanCmd.ssid;
+                if (pItemSSID->len > WLAN_SSID_MAXLEN + 1)
+                        return -EINVAL;
                 if (pItemSSID->len != 0) {
                         memset(abyScanSSID, 0, WLAN_IEHDR_LEN + WLAN_SSID_MAXLEN + 1);
                         memcpy(abyScanSSID, pItemSSID, pItemSSID->len + WLAN_IEHDR_LEN);
@@ -155,6 +157,8 @@ int private_ioctl(PSDevice pDevice, struct ifreq *rq)
                 }
 
                 pItemSSID = (PWLAN_IE_SSID)sJoinCmd.ssid;
+                if (pItemSSID->len > WLAN_SSID_MAXLEN + 1)
+                        return -EINVAL;
                 memset(pMgmt->abyDesireSSID, 0, WLAN_IEHDR_LEN + WLAN_SSID_MAXLEN + 1);
                 memcpy(pMgmt->abyDesireSSID, pItemSSID, pItemSSID->len + WLAN_IEHDR_LEN);
                 if (sJoinCmd.wBSSType == ADHOC) {
@@ -476,6 +480,8 @@ int private_ioctl(PSDevice pDevice, struct ifreq *rq)
                 }
 
                 pItemSSID = (PWLAN_IE_SSID)sStartAPCmd.ssid;
+                if (pItemSSID->len > WLAN_SSID_MAXLEN + 1)
+                        return -EINVAL;
                 memset(pMgmt->abyDesireSSID, 0, WLAN_IEHDR_LEN + WLAN_SSID_MAXLEN + 1);
                 memcpy(pMgmt->abyDesireSSID, pItemSSID, pItemSSID->len + WLAN_IEHDR_LEN);