[PATCH] fix kernel oops with badly formatted module option

Catch malformed kernel parameter usage of "param = value". Spaces are not
supported, but don't cause a kernel fault on such usage, just report an
error.

Signed-off-by: Randy Dunlap <[e-mail]>
Acked-by: Larry Finger <[e-mail]>
Acked-by: Rusty Russell <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/params.c

···
 {
 	struct kparam_string *kps = kp->arg;
 
+	if (!val) {
+		printk(KERN_ERR "%s: missing param set value\n", kp->name);
+		return -EINVAL;
+	}
 	if (strlen(val)+1 > kps->maxlen) {
 		printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
 		       kp->name, kps->maxlen-1);