tc: filter: validate filter priority in userspace.
Because we use the high 16 bits of tcm_info to pass prio value to
kernel, thus it's range would be [0, 0xffff], without validation
in tc when user pass a lager(>65535) priority, the actual priority
set in kernel would confuse the user.
So, add a validation to ensure prio in the range.
diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index 207302f..04c3b82 100644
--- a/tc/tc_filter.c
+++ b/tc/tc_filter.c
@@ -105,7 +105,7 @@
NEXT_ARG();
if (prio)
duparg("priority", *argv);
- if (get_u32(&prio, *argv, 0))
+ if (get_u32(&prio, *argv, 0) || prio > 0xFFFF)
invarg(*argv, "invalid priority value");
} else if (matches(*argv, "protocol") == 0) {
__u16 id;
