commit 1f37070d3ff325827c6213e51b57f21fd5ac9d05
author Stephen Hemminger <shemminger@vyatta.com> Tue May 24 13:50:52 2011 -0400
committer David S. Miller <davem@davemloft.net> Tue May 24 13:50:52 2011 -0400
tree ac0d1bc0a5e2cdaaeedb72b2ba049141ea16121c
parent 5d8bee676fc9fc9389302baa9ba47bc2ed885f64

dst: catch uninitialized metrics

Catch cases where dst_metric_set() and other functions are called
but _metrics is NULL.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/dst.h

diff --git a/include/net/dst.h b/include/net/dst.h
index 07a0402..7d15d23 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -111,6 +111,8 @@
 {
 	unsigned long p = dst->_metrics;
 
+	BUG_ON(!p);
+
 	if (p & DST_METRICS_READ_ONLY)
 		return dst->ops->cow_metrics(dst, p);
 	return __DST_METRICS_PTR(p);