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>
git-mirror · May 24, 2011 · 1f37070 · 1f37070
1 parent 5d8bee6
commit 1f37070
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/include/net/dst.h b/include/net/dst.h
@@ -111,6 +111,8 @@ static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst)
 {
 	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);