1 files changed, 6 insertions, 3 deletions

diff --git a/net/wireless/wext.c b/net/wireless/wext.c
index 5b4a0cee4418..ac4ac26b53ce 100644
--- a/net/wireless/wext.c
+++ b/net/wireless/wext.c
@@ -773,10 +773,13 @@ static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
                         essid_compat = 1;
                 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
                         char essid[IW_ESSID_MAX_SIZE + 1];
+                        unsigned int len;
+                        len = iwp->length * descr->token_size;
 
-                        err = copy_from_user(essid, iwp->pointer,
-                                             iwp->length *
-                                             descr->token_size);
+                        if (len > IW_ESSID_MAX_SIZE)
+                                return -EFAULT;
+
+                        err = copy_from_user(essid, iwp->pointer, len);
                         if (err)
                                 return -EFAULT;